[flang] Move runtime API headers to flang/include/flang/Runtime

Move the closure of the subset of flang/runtime/*.h header files that
are referenced by source files outside flang/runtime (apart from

[flang] Move runtime API headers to flang/include/flang/Runtime

Move the closure of the subset of flang/runtime/*.h header files that
are referenced by source files outside flang/runtime (apart from unit tests)
into a new directory (flang/include/flang/Runtime) so that relative
include paths into ../runtime need not be used.

flang/runtime/pgmath.h.inc is moved to flang/include/flang/Evaluate;
it's not used by the runtime.

Differential Revision: https://reviews.llvm.org/D109107

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[flang] Implement runtime Assign()

Define an API for, and implement, runtime support for arbitrary
assignment of one descriptor's data to another, with full support for
(re)allocation of allocatable

[flang] Implement runtime Assign()

Define an API for, and implement, runtime support for arbitrary
assignment of one descriptor's data to another, with full support for
(re)allocation of allocatables with finalization when necessary,
user-defined derived type assignment TBP calls, and intrinsic (default)
componentwise assignment of derived type instances with allocation of
automatic components. Also clean up API and implementation of
finalization/destruction using knowledge gained while studying
edge cases for assignment in the 2018 standard.

The look-up procedure for special procedure bindings in derived
types has been optimized from O(N) to O(1) since it will probably
matter more. This required some analysis in runtime derived type
description table construction in semantics and some changes to the
table schemata.

Executable Fortran tests have been developed; they'll be added
to the test base once they can be lowered and run by f18.

Differential Revision: https://reviews.llvm.org/D107678

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[flang] Run-time derived type initialization and destruction

Use derived type information tables to drive default component
initialization (when needed), component destruction, and calls to
final su

[flang] Run-time derived type initialization and destruction

Use derived type information tables to drive default component
initialization (when needed), component destruction, and calls to
final subroutines. Perform these operations automatically for
ALLOCATE()/DEALLOCATE() APIs for allocatables, automatics, and
pointers. Add APIs for use in lowering to perform these operations
for non-allocatable/automatic non-pointer variables.
Data pointer component initialization supports arbitrary constant
designators, a F'2008 feature, which may be a first for Fortran
implementations.

Differential Revision: https://reviews.llvm.org/D106297

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[flang] Runtime API for data pointers

Define and implement an API for use by lowering to
implement operations on pointers.

Differential Revision: https://reviews.llvm.org/D106170

[flang] Implement more transformational intrinsic functions in runtime

Define APIs, naively implement, and add basic sanity unit tests for
the transformational intrinsic functions CSHIFT, EOSHIFT, P

[flang] Implement more transformational intrinsic functions in runtime

Define APIs, naively implement, and add basic sanity unit tests for
the transformational intrinsic functions CSHIFT, EOSHIFT, PACK,
SPREAD, TRANSPOSE, and UNPACK. These are the remaining transformational
intrinsic functions that rearrange data without regard to type
(except for default boundary values in EOSHIFT); RESHAPE was already
in place as a stress test for the runtime's descriptor handling
facilities.

Code is in place to create copies of allocatable/automatic
components when transforming arrays of derived type, but it won't
do anything until we have derived type information being passed to the
runtime from the frontend.

Differential Revision: https://reviews.llvm.org/D102857

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[flang] Update DE/ALLOCATE statement runtime message processing

Make error message descriptors on runtime DE/ALLOCATE API calls constant.
Fix a bug in error message truncation/padding.

Differential

[flang] Update DE/ALLOCATE statement runtime message processing

Make error message descriptors on runtime DE/ALLOCATE API calls constant.
Fix a bug in error message truncation/padding.

Differential Revision: https://reviews.llvm.org/D98551

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[flang] Implement derived type description table encoding

Define Fortran derived types that describe the characteristics
of derived types, and instantiations of parameterized derived
types, that are

[flang] Implement derived type description table encoding

Define Fortran derived types that describe the characteristics
of derived types, and instantiations of parameterized derived
types, that are of relevance to the runtime language support
library. Define a suite of corresponding C++ structure types
for the runtime library to use to interpret instances of the
descriptions.

Create instances of these description types in Semantics as
static initializers for compiler-created objects in the scopes
that define or instantiate user derived types.

Delete obsolete code from earlier attempts to package runtime
type information.

Differential Revision: https://reviews.llvm.org/D92802

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fix clang build

[flang] Implement runtime support for basic ALLOCATE/DEALLOCATE

Add error reporting infrastructure and support for ALLOCATE
and DEALLOCATE statements of intrinsic types without SOURCE=
or MOLD=.

Di

[flang] Implement runtime support for basic ALLOCATE/DEALLOCATE

Add error reporting infrastructure and support for ALLOCATE
and DEALLOCATE statements of intrinsic types without SOURCE=
or MOLD=.

Differential revision: https://reviews.llvm.org/D91215

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[flang] Define CHARACTER runtime API, establish placeholder implementations

formatting

Original-commit: flang-compiler/f18@1d287d9d59eaee357db604dd9986c74c298a7b4d
Reviewed-on: https://github.com/f

[flang] Define CHARACTER runtime API, establish placeholder implementations

formatting

Original-commit: flang-compiler/f18@1d287d9d59eaee357db604dd9986c74c298a7b4d
Reviewed-on: https://github.com/flang-compiler/f18/pull/1096

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