Revert "[flang][OpenMP] Lowering support for default clause"

This reverts commit 05e6fce84fd39d150195b8928561f2c90c71e538.

[flang][OpenMP] Lowering support for default clause

This patch adds lowering support for default clause.

1. During symbol resolution in semantics, should the enclosing context have
a default data s

[flang][OpenMP] Lowering support for default clause

This patch adds lowering support for default clause.

1. During symbol resolution in semantics, should the enclosing context have
a default data sharing clause defined and a `parser::Name` is not attached
to an explicit data sharing clause, the
`semantics::Symbol::Flag::OmpPrivate` flag (in case of `default(private)`)
and `semantics::Symbol::Flag::OmpFirstprivate` flag (in case of
`default(firstprivate)`) is added to the symbol.

2. During lowering, all symbols having either
`semantics::Symbol::Flag::OmpPrivate` or
`semantics::Symbol::Flag::OmpFirstprivate` flag are collected and
privatised appropriately.

Co-authored-by: Peixin Qiao <[email protected]>

Reviewed By: kiranchandramohan

Differential Revision: https://reviews.llvm.org/D123930

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[flang] Correct IsHostAssociated() to be true for BLOCK constructs

The predicate IsHostAssocited() was implemented in a way that would
return true only for cases of host association into a module or

[flang] Correct IsHostAssociated() to be true for BLOCK constructs

The predicate IsHostAssocited() was implemented in a way that would
return true only for cases of host association into a module or inner
subprogram. Technically, the use of a name in a BLOCK construct
that is not declared therein is considered in the Fortran standard
to also be a form of host association, and this matters when doing
error checking on DATA statements.

Differential Revision: https://reviews.llvm.org/D130388

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