Added helper functions for fixed register allocation.

src/fast-codegen.h

 // Copyright 2010 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 61 matching lines @@
   void Generate(CompilationInfo* compilation_info);
 
  private:
   MacroAssembler* masm() { return masm_; }
   CompilationInfo* info() { return info_; }
   Label* bailout() { return &bailout_; }
 
   FunctionLiteral* function() { return info_->function(); }
   Scope* scope() { return info_->scope(); }
 
+  // Platform-specific fixed registers, all guaranteed distinct.
+  Register accumulator0();
+  Register accumulator1();
+  Register scratch0();
+  Register scratch1();
+  Register receiver_reg();
+  Register context_reg();
+
   // AST node visit functions.
 #define DECLARE_VISIT(type) virtual void Visit##type(type* node);
   AST_NODE_LIST(DECLARE_VISIT)
 #undef DECLARE_VISIT
 
-  // Emit code to load the receiver from the stack into a given register.
-  void EmitLoadReceiver(Register reg);
+  // Emit code to load the receiver from the stack into the fixed receiver
+  // register.
+  void EmitLoadReceiver();
 
   // Emit code to check that the receiver has the same map as the
   // compile-time receiver.  Receiver is expected in {ia32-edx, x64-rdx,
   // arm-r1}.  Emit a branch to the (single) bailout label if check fails.
   void EmitReceiverMapCheck();
 
   // Emit code to check that the global object has the same map as the
   // global object seen at compile time.
   void EmitGlobalMapCheck();
 
@@ skipping 12 matching lines @@
 
   Label bailout_;
 
   DISALLOW_COPY_AND_ASSIGN(FastCodeGenerator);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_FAST_CODEGEN_H_