PrologEpilogInserter: Clean up math in calculateFrameObjectOffsets

There is no need to open-code the alignment calculation, we have a
handy RoundUpToAlignment function which "Does The Right Thing (TM)".

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230392 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed