Add a new control flow simplifier.

Run it in the dead code elimination phase, as it relates to
creating dead branches.

From 0.04 to 0.07% less code size framework/gms/docs/fb (70K saved on fb)
3%-5% runtime performance improvements on Richards/DeltaBlue/Ritz.
Compile-time is mixed, so in the noise (from 2% slower to 1% faster).

test:611-checker-simplify-if

Change-Id: Ife8b7882d57b5481f5ca9dc163beba655d7e78bf

1 files changed, 4 insertions, 1 deletions

diff --git a/compiler/optimizing/dead_code_elimination.h b/compiler/optimizing/dead_code_elimination.h
index 8d6008b845..0ce0ec1402 100644
--- a/compiler/optimizing/dead_code_elimination.h
+++ b/compiler/optimizing/dead_code_elimination.h
@@ -41,8 +41,11 @@ class HDeadCodeElimination : public HOptimization {
 
  private:
   void MaybeRecordDeadBlock(HBasicBlock* block);
-  void RemoveDeadBlocks();
+  void MaybeRecordSimplifyIf();
+  bool RemoveDeadBlocks();
   void RemoveDeadInstructions();
+  bool SimplifyIfs();
+  void ConnectSuccessiveBlocks();
 
   DISALLOW_COPY_AND_ASSIGN(HDeadCodeElimination);
 };