Revert "Revert "ARM/ARM64: Extend support of instruction combining.""

This reverts commit 6b5afdd144d2bb3bf994240797834b5666b2cf98.

Change-Id: Ic27a10f02e21109503edd64e6d73d1bb0c6a8ac6
diff --git a/compiler/optimizing/optimizing_compiler.cc b/compiler/optimizing/optimizing_compiler.cc
index b1891c9..5a9f258 100644
--- a/compiler/optimizing/optimizing_compiler.cc
+++ b/compiler/optimizing/optimizing_compiler.cc
@@ -60,6 +60,7 @@
 #include "induction_var_analysis.h"
 #include "inliner.h"
 #include "instruction_simplifier.h"
+#include "instruction_simplifier_arm.h"
 #include "intrinsics.h"
 #include "jit/debugger_interface.h"
 #include "jit/jit_code_cache.h"
@@ -438,7 +439,10 @@
     case kThumb2:
     case kArm: {
       arm::DexCacheArrayFixups* fixups = new (arena) arm::DexCacheArrayFixups(graph, stats);
+      arm::InstructionSimplifierArm* simplifier =
+          new (arena) arm::InstructionSimplifierArm(graph, stats);
       HOptimization* arm_optimizations[] = {
+        simplifier,
         fixups
       };
       RunOptimizations(arm_optimizations, arraysize(arm_optimizations), pass_observer);