Fix build by fixing a typo in codegen-x64.cc.

src/x64/codegen-x64.cc

 // 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 8274 matching lines @@
   // Both fsin and fcos require arguments in the range +/-2^63 and
   // return NaN for infinities and NaN. They can share all code except
   // the actual fsin/fcos operation.
   Label in_range;
   // If argument is outside the range -2^63..2^63, fsin/cos doesn't
   // work. We must reduce it to the appropriate range.
   __ movq(rdi, rbx);
   // Move exponent and sign bits to low bits.
   __ shr(rdi, Immediate(HeapNumber::kMantissaBits));
   // Remove sign bit.
-  __ andl(rdi, Immediate((1 << HeapNumber::KExponentBits) - 1));
+  __ andl(rdi, Immediate((1 << HeapNumber::kExponentBits) - 1));
   int supported_exponent_limit = (63 + HeapNumber::kExponentBias);
   __ cmpl(rdi, Immediate(supported_exponent_limit));
   __ j(below, &in_range);
   // Check for infinity and NaN. Both return NaN for sin.
   __ cmpl(rdi, Immediate(0x7ff));
   __ j(equal, on_nan_result);
 
   // Use fpmod to restrict argument to the range +/-2*PI.
   __ fldpi();
   __ fadd(0);
@@ skipping 3638 matching lines @@
 }
 
 #endif
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64