Replace nonexistent a4 by t0 on mips.

src/mips/code-stubs-mips.cc

 // Copyright 2012 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 3240 matching lines @@
   }
 
   // Fast-case: Invoke the function now.
   // a1: pushed function
   ParameterCount actual(argc_);
 
   if (CallAsMethod()) {
     if (NeedsChecks()) {
       // Do not transform the receiver for strict mode functions and natives.
       __ lw(a3, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
-      __ lw(a4, FieldMemOperand(a3, SharedFunctionInfo::kCompilerHintsOffset));
+      __ lw(t0, FieldMemOperand(a3, SharedFunctionInfo::kCompilerHintsOffset));
       int32_t strict_mode_function_mask =
           1 <<  (SharedFunctionInfo::kStrictModeFunction + kSmiTagSize);
       int32_t native_mask = 1 << (SharedFunctionInfo::kNative + kSmiTagSize);
-      __ And(at, a4, Operand(strict_mode_function_mask | native_mask));
+      __ And(at, t0, Operand(strict_mode_function_mask | native_mask));
       __ Branch(&cont, ne, at, Operand(zero_reg));
     }
 
     // Compute the receiver in non-strict mode.
     __ lw(a3, MemOperand(sp, argc_ * kPointerSize));
 
     if (NeedsChecks()) {
       __ JumpIfSmi(a3, &wrap);
-      __ GetObjectType(a3, a4, a4);
-      __ Branch(&wrap, lt, a4, Operand(FIRST_SPEC_OBJECT_TYPE));
+      __ GetObjectType(a3, t0, t0);
+      __ Branch(&wrap, lt, t0, Operand(FIRST_SPEC_OBJECT_TYPE));
     } else {
       __ jmp(&wrap);
     }
 
     __ bind(&cont);
   }
   __ InvokeFunction(a1, actual, JUMP_FUNCTION, NullCallWrapper());
 
   if (NeedsChecks()) {
     // Slow-case: Non-function called.
@@ skipping 2438 matching lines @@
                               MemOperand(fp, 6 * kPointerSize),
                               NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS