Fix clang compilation error.

src/arm64/code-stubs-arm64.cc

 // Copyright 2013 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_ARM64
 
 #include "src/bootstrapper.h"
 #include "src/code-stubs.h"
@@ skipping 3107 matching lines @@
     __ CallExternalReference(miss, 4);
 
     // Move result to edi and exit the internal frame.
     __ Mov(x1, x0);
   }
 }
 
 
 void StringCharCodeAtGenerator::GenerateFast(MacroAssembler* masm) {
   // If the receiver is a smi trigger the non-string case.
-  __ JumpIfSmi(object_, receiver_not_string_);
+  if (check_mode_ == RECEIVER_IS_UNKNOWN) {
+    __ JumpIfSmi(object_, receiver_not_string_);
 
-  // Fetch the instance type of the receiver into result register.
-  __ Ldr(result_, FieldMemOperand(object_, HeapObject::kMapOffset));
-  __ Ldrb(result_, FieldMemOperand(result_, Map::kInstanceTypeOffset));
+    // Fetch the instance type of the receiver into result register.
+    __ Ldr(result_, FieldMemOperand(object_, HeapObject::kMapOffset));
+    __ Ldrb(result_, FieldMemOperand(result_, Map::kInstanceTypeOffset));
 
-  // If the receiver is not a string trigger the non-string case.
-  __ TestAndBranchIfAnySet(result_, kIsNotStringMask, receiver_not_string_);
+    // If the receiver is not a string trigger the non-string case.
+    __ TestAndBranchIfAnySet(result_, kIsNotStringMask, receiver_not_string_);
+  }
 
   // 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.
   __ Ldrsw(result_, UntagSmiFieldMemOperand(object_, String::kLengthOffset));
   __ Cmp(result_, Operand::UntagSmi(index_));
   __ B(ls, index_out_of_range_);
 
@@ skipping 1942 matching lines @@
                               MemOperand(fp, 6 * kPointerSize),
                               NULL);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM64