Fangrui Song b3b970744d [ThinLTO] Add Visibility bits to GlobalValueSummary::GVFlags ... Imported functions and variable get the visibility from the module supplying the definition. However, non-imported definitions do not get the visibility from (ELF) the most constraining visibility among all modules (Mach-O) the visibility of the prevailing definition. This patch * adds visibility bits to GlobalValueSummary::GVFlags * computes the result visibility and propagates it to all definitions Protected/hidden can imply dso_local which can enable some optimizations (this is stronger than GVFlags::DSOLocal because the implied dso_local can be leveraged for ELF -shared while default visibility dso_local has to be cleared for ELF -shared). Note: we don't have summaries for declarations, so for ELF if a declaration has the most constraining visibility, the result visibility may not be that one. Differential Revision: https://reviews.llvm.org/D92900		2021-01-27 10:43:51 -08:00
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Reader	[ThinLTO] Add Visibility bits to GlobalValueSummary::GVFlags	2021-01-27 10:43:51 -08:00
Writer	[ThinLTO] Add Visibility bits to GlobalValueSummary::GVFlags	2021-01-27 10:43:51 -08:00
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