A64: Improve the deoptimization helpers to generate fewer instructions.

src/a64/lithium-codegen-a64.h

Index: src/a64/lithium-codegen-a64.h
diff --git a/src/a64/lithium-codegen-a64.h b/src/a64/lithium-codegen-a64.h
index 006165157f46740fd44428a3a4322eb64c56ad7b..74dad62b92dbbe0d793dc6fd63b64ba74c2f35da 100644
--- a/src/a64/lithium-codegen-a64.h
+++ b/src/a64/lithium-codegen-a64.h
@@ -218,12 +218,12 @@ class LCodeGen: public LCodeGenBase {
                                    Register temp,
                                    LOperand* index,
                                    String::Encoding encoding);
-  Deoptimizer::BailoutType DeoptimizeHeader(
+  void DeoptimizeBranch(
       LEnvironment* environment,
-      Deoptimizer::BailoutType* override_bailout_type);
-  void Deoptimize(LEnvironment* environment);
+      BranchType branch_type, Register reg = NoReg, int bit = -1,
+      Deoptimizer::BailoutType* override_bailout_type = NULL);
   void Deoptimize(LEnvironment* environment,
-                  Deoptimizer::BailoutType bailout_type);
+                  Deoptimizer::BailoutType* override_bailout_type = NULL);
   void DeoptimizeIf(Condition cc, LEnvironment* environment);
   void DeoptimizeIfZero(Register rt, LEnvironment* environment);
   void DeoptimizeIfNegative(Register rt, LEnvironment* environment);