[MBP] Code cleanup /NFC

This is second patch to clean up the code.

In this patch, the logic to determine block outlinining
is refactored and more comments are added.
 


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@272514 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed