[GVN] Invalidate cached info for values replaced by equality propagation

When GVN propagates an equality by replacing one value with another it also
needs to invalidate the cached information for the value being replaced.

Differential Revision: https://reviews.llvm.org/D51218


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@341820 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed