[SCCP] Don't delete side-effecting instructions

I'm not sure if the `!isa<CallInst>(Inst) &&
!isa<TerminatorInst>(Inst))` bit is correct either, but this fixes the
case we know is broken.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@279647 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed