Implement umbrella directories for modules, which are similar to
umbrella headers in the sense that all of the headers within that
directory (and eventually its subdirectories) are considered to be
p

Implement umbrella directories for modules, which are similar to
umbrella headers in the sense that all of the headers within that
directory (and eventually its subdirectories) are considered to be
part of the module with that umbrella directory. However, unlike
umbrella headers, which are expected to include all of the headers
within their subdirectories, Clang will automatically include all of
the headers it finds in the named subdirectory.

The intent here is to allow a module map to trivially turn a
subdirectory into a module, where the module's structure can mimic the
directory structure.

llvm-svn: 146165

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Tweak the module map file test slightly, by putting one of the headers
into a submodule. Submodules aren't actually supported anywhere else,
but we do parse them, so this verifies that we're at least

Tweak the module map file test slightly, by putting one of the headers
into a submodule. Submodules aren't actually supported anywhere else,
but we do parse them, so this verifies that we're at least seeing
through them properly.

llvm-svn: 144436

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Introduce basic support for parsing module map files.

Module map files provide a way to map between headers and modules, so
that we can layer a module system on top of existing headers without
chang

Introduce basic support for parsing module map files.

Module map files provide a way to map between headers and modules, so
that we can layer a module system on top of existing headers without
changing those headers at all.

This commit introduces the module map file parser and the module map
that it generates, and wires up the module map file parser so that
we'll automatically find module map files as part of header
search. Note that we don't yet use the information stored in the
module map.

llvm-svn: 144402

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