InstCombine: Don't fold call bitcast into args if callee is byval

This fixes a bug reported here:
http://lists.cs.uiuc.edu/pipermail/llvm-commits/Week-of-Mon-20150309/265341.html

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@231948 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed