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 203 matching lines @@
   void PopulateDeoptimizationData(Handle<Code> code);
   void PopulateDeoptimizationLiteralsWithInlinedFunctions();
 
   MemOperand BuildSeqStringOperand(Register string,
                                    Register temp,
                                    LOperand* index,
                                    String::Encoding encoding);
   Deoptimizer::BailoutType DeoptimizeHeader(
       LEnvironment* environment,
       Deoptimizer::BailoutType* override_bailout_type);
+  void DeoptimizeBranch(LEnvironment* environment,
+                        Deoptimizer::BailoutType bailout_type,
+                        BranchType branch_type,
+                        Register reg = NoReg,
+                        int bit = -1);
+  void DeoptimizeBranch(LEnvironment* environment,
+                        BranchType branch_type,
+                        Register reg = NoReg,
+                        int bit = -1) {
+    Deoptimizer::BailoutType bailout_type = DeoptimizeHeader(environment, NULL);
+    DeoptimizeBranch(environment, bailout_type, branch_type, reg, bit);
+  }
   void Deoptimize(LEnvironment* environment);
   void Deoptimize(LEnvironment* environment,
                   Deoptimizer::BailoutType bailout_type);
   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,
@@ skipping 230 matching lines @@
 
  protected:
   MacroAssembler* masm() const { return codegen_->masm(); }
 
   LCodeGen* codegen_;
 };
 
 } }  // namespace v8::internal
 
 #endif  // V8_A64_LITHIUM_CODEGEN_A64_H_