[BPI] NFC: reorder ifs to bail out earlier

This is non-functional change to re-order if statements to bail out earlier
from unreachable and ColdCall heuristics.

Reviewers: sanjoy, reames, junbuml, vsk, chandlerc

Reviewed By: chandlerc

Subscribers: llvm-commits

Differential Revision: https://reviews.llvm.org/D31704

llvm-svn: 300442