Early exit with cheaper checks

Reviewers: sebpop,davide,fhahn,trentxintong
Differential Revision: https://reviews.llvm.org/D49617

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@337643 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed