[InstCombine] fix matcher to bind to specific operand (PR32830)

Matching any random value would be very wrong:
https://bugs.llvm.org/show_bug.cgi?id=32830


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@301594 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed