Richard Smith d13863008b Add #pragma clang module begin/end pragmas and generate them when preprocessing a module. ...

These pragmas are intended to simulate the effect of entering or leaving a file
with an associated module. This is not completely implemented yet: declarations
between the pragmas will not be attributed to the correct module, but macro
visibility is already functional.

Modules named by #pragma clang module begin must already be known to clang (in
some module map that's either loaded or on the search path).

llvm-svn: 302098

2017-05-04 00:29:54 +00:00

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