MergeFunc: preserve COMDAT information when creating a thunk
We would previously drop the COMDAT on the thunk we generated when replacing a
function body with the forwarding thunk. This would result in a function that
may have been multiply emitted and multiply merged to be emitted with the same
name without the COMDAT. This is a hard error with PE/COFF where the COMDAT is
used for the deduplication of Value Witness functions for Swift.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@358728
91177308-0d34-0410-b5e6-
96231b3b80d8
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