[GVN] Fold constant expression in GVN.
 
Fix for PR 28418.

opt never finishes compiling a test when -gvn option is passed.
The problem is caused by the fact that GVN fails to fold a constant expression.

Differential Revision: https://reviews.llvm.org/D22185



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@275483 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed