A64: Improve the deoptimization helpers to generate fewer instructions.

src/a64/lithium-codegen-a64.h

 // Copyright 2013 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 200 matching lines @@
                          SmiCheck check_needed);
 
   int DefineDeoptimizationLiteral(Handle<Object> literal);
   void PopulateDeoptimizationData(Handle<Code> code);
   void PopulateDeoptimizationLiteralsWithInlinedFunctions();
 
   MemOperand BuildSeqStringOperand(Register string,
                                    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);
   void DeoptimizeIfSmi(Register rt, LEnvironment* environment);
   void DeoptimizeIfNotSmi(Register rt, LEnvironment* environment);
   void DeoptimizeIfRoot(Register rt,
                         Heap::RootListIndex index,
                         LEnvironment* environment);
   void DeoptimizeIfNotRoot(Register rt,
                            Heap::RootListIndex index,
@@ skipping 227 matching lines @@
 
  protected:
   MacroAssembler* masm() const { return codegen_->masm(); }
 
   LCodeGen* codegen_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_A64_LITHIUM_CODEGEN_A64_H_