[IR] add/use isIntDivRem convenience function

There are more existing potential users of this,
but I've limited this patch to the first couple
that I found to minimize typo risk.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@335157 91177308-0d34-0410-b5e6-96231b3b80d8
3 files changed