Replace nonexistent a4 by t0 on mips.

BUG=
R=ulan@chromium.org

Review URL: https://codereview.chromium.org/136093010

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@19016 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/mips/code-stubs-mips.cc

@@ -3258,11 +3258,11 @@ void CallFunctionStub::Generate(MacroAssembler* masm) {
     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));
     }
 
@@ -3271,8 +3271,8 @@ void CallFunctionStub::Generate(MacroAssembler* masm) {
 
     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);
     }