[LVI] Fix LVI compile time regression around constantFoldUser()
Summary:
Avoid checking each operand and calling getValueFromCondition() before calling
constantFoldUser() when the instruction type isn't supported by
constantFoldUser().
This fixes a large compile time regression in an internal build.
Reviewers: sanjoy
Reviewed By: sanjoy
Subscribers: llvm-commits
Differential Revision: https://reviews.llvm.org/D36552
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@310545
91177308-0d34-0410-b5e6-
96231b3b80d8