ValueMapper: Stop memoizing ConstantAsMetadata
Stop memoizing ConstantAsMetadata in ValueMapper::mapMetadata. Now we
have to recompute it, but these metadata aren't particularly common, and
it restricts the lifetime of the Metadata map unnecessarily.
(The motivation is that I have a patch which uses a single Metadata map
for the lifetime of IRMover. Mehdi profiled r266446 with the patch
applied and we saw a pretty big speedup in lib/Linker.)
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@266513 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed