[MBP] do not reorder and move up loop latch block

Do not reorder and move up a loop latch block before a loop header
when optimising for size because this will generate an extra 
unconditional branch.

Differential Revision: https://reviews.llvm.org/D22521


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@278840 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed