Fix clang compilation error.

src/mips/code-stubs-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_MIPS
 
 #include "src/base/bits.h"
 #include "src/bootstrapper.h"
@@ skipping 2919 matching lines @@
     __ mov(a1, v0);
   }
 }
 
 
 // StringCharCodeAtGenerator.
 void StringCharCodeAtGenerator::GenerateFast(MacroAssembler* masm) {
   DCHECK(!t0.is(index_));
   DCHECK(!t0.is(result_));
   DCHECK(!t0.is(object_));
+  if (check_mode_ == RECEIVER_IS_UNKNOWN) {
+    // If the receiver is a smi trigger the non-string case.
+    __ JumpIfSmi(object_, receiver_not_string_);
 
-  // If the receiver is a smi trigger the non-string case.
-  __ JumpIfSmi(object_, receiver_not_string_);
-
-  // Fetch the instance type of the receiver into result register.
-  __ lw(result_, FieldMemOperand(object_, HeapObject::kMapOffset));
-  __ lbu(result_, FieldMemOperand(result_, Map::kInstanceTypeOffset));
-  // If the receiver is not a string trigger the non-string case.
-  __ And(t0, result_, Operand(kIsNotStringMask));
-  __ Branch(receiver_not_string_, ne, t0, Operand(zero_reg));
+    // Fetch the instance type of the receiver into result register.
+    __ lw(result_, FieldMemOperand(object_, HeapObject::kMapOffset));
+    __ lbu(result_, FieldMemOperand(result_, Map::kInstanceTypeOffset));
+    // If the receiver is not a string trigger the non-string case.
+    __ And(t0, result_, Operand(kIsNotStringMask));
+    __ Branch(receiver_not_string_, ne, t0, Operand(zero_reg));
+  }
 
   // If the index is non-smi trigger the non-smi case.
   __ JumpIfNotSmi(index_, &index_not_smi_);
 
   __ bind(&got_smi_index_);
 
   // Check for index out of range.
   __ lw(t0, FieldMemOperand(object_, String::kLengthOffset));
   __ Branch(index_out_of_range_, ls, t0, Operand(index_));
 
@@ skipping 1966 matching lines @@
                               MemOperand(fp, 6 * kPointerSize),
                               NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS