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Vlad Tsyrklevich 54c0192722 [ThinLTOBitcodeWriter] Emit summaries for regular LTO modules

Summary:
Emit summaries for bitcode modules that are only destined for the
regular LTO portion of the build so they can participate in
summary-based dead stripping.

This change reduces the size of a nacl_helper build with cfi-icall
enabled by 7%, removing the majority of the overhead due to enabling
cfi-icall. The cfi-icall size increase was caused by compiling in lots
of unused code and cfi-icall generating jumptable references to unused
symbols that could no longer be removed by -Wl,-gc-sections. Increasing
the visibility of summary-based dead stripping prevented jumptable
entries being created for unused symbols from the regular LTO portion
of the build.

Reviewers: pcc

Reviewed By: pcc

Subscribers: dschuff, mehdi_amini, inglorion, eraman, llvm-commits, kcc

Differential Revision: https://reviews.llvm.org/D47594

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@333768 91177308-0d34-0410-b5e6-96231b3b80d8

2018-06-01 15:20:47 +00:00

x86

[ThinLTO] fix test failure without x86 backend

2018-02-06 07:03:09 +00:00

circular-reference.ll

ThinLTOBitcodeWriter: Do not follow operand edges of type GlobalValue when looking for virtual functions.

2017-03-02 23:10:17 +00:00

comdat.ll

Make GlobalValues with non-default visibilility dso_local.

2018-01-18 02:08:23 +00:00

filter-alias.ll

ThinLTOBitcodeWriter: Try harder to discard unused references to the merged module.