[InstCombine] Add an InstCombine specific wrapper around isKnownToBeAPowerOfTwo to shorten code. NFC

We have wrappers for several other ValueTracking methods that take care of passing all of the analysis and assumption cache parameters. This extends it to isKnownToBeAPowerOfTwo.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@303924 91177308-0d34-0410-b5e6-96231b3b80d8
4 files changed