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Improve scheduling with branch coalescing

Authored by nemanjai on Mar 1 2017, 12:29 PM.

Description

Improve scheduling with branch coalescing

This patch adds a MachineSSA pass that coalesces blocks that branch
on the same condition.

Committing on behalf of Lei Huang.

Differential Revision: https://reviews.llvm.org/D28249

llvm-svn: 296670