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Commit e450a51e authored by Richard Smith's avatar Richard Smith
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[modules] If we re-enter a submodule from within itself (when submodule 

visibility is enabled) or leave and re-enter it, restore the macro and module
visibility state from last time we were in that submodule.

This allows mutually-#including header files to stand a chance at being
modularized with local visibility enabled.


git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@237871 91177308-0d34-0410-b5e6-96231b3b80d8
parent 57a4230d
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