tree c28a3cdbb689a7b5b8a4e373ede190d1b4b45175
parent 46f939c1183560064effc6b838ffdc397df265ac
author Saleem Abdulrasool <compnerd@compnerd.org> 1550852990 +0000
committer Saleem Abdulrasool <compnerd@compnerd.org> 1550852990 +0000

CodeGen: use COMDAT for block copy/destroy helpers

SVN r339438 added support to deduplicate the helpers by using a consistent
naming scheme and using LinkOnceODR semantics.  This works on ELF by means of
weak linking semantics, and entirely does not work on PE/COFF where you end up
with multiply defined strong symbols, which is a strong error on PE/COFF.
Assign the functions a COMDAT group so that they can be uniqued by the linker.
This fixes the use of blocks in CoreFoundation on Windows.

llvm-svn: 354678