Haicheng Wu 77ea344786 [MBP] Reduce code size by running tail merging in MBP. ...

The code layout that TailMerging (inside BranchFolding) works on is not the
final layout optimized based on the branch probability. Generally, after
BlockPlacement, many new merging opportunities emerge.

This patch calls Tail Merging after MBP and calls MBP again if Tail Merging
merges anything.

Differential Revision: http://reviews.llvm.org/D20276

llvm-svn: 271925

2016-06-06 18:36:07 +00:00

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