Another x64 build fix. Actually builds now.

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 8351 matching lines @@
   Register double_value = rdi;
   Label done, exponent_63_plus;
   // Get double and extract exponent.
   __ movq(double_value, FieldOperand(source, HeapNumber::kValueOffset));
   // Clear result preemptively, in case we need to return zero.
   __ xorl(result, result);
   __ movq(xmm0, double_value);  // Save copy in xmm0 in case we need it there.
   // Double to remove sign bit, shift exponent down to least significant bits.
   // and subtract bias to get the unshifted, unbiased exponent.
   __ lea(double_exponent, Operand(double_value, double_value, times_1, 0));
-  __ shr(double_exponent, Immediate(64 - HeapNumber::KExponentBits));
+  __ shr(double_exponent, Immediate(64 - HeapNumber::kExponentBits));
   __ subl(double_exponent, Immediate(HeapNumber::kExponentBias));
   // Check whether the exponent is too big for a 63 bit unsigned integer.
   __ cmpl(double_exponent, Immediate(63));
   __ j(above_equal, &exponent_63_plus);
   // Handle exponent range 0..62.
   __ cvttsd2siq(result, xmm0);
   __ jmp(&done);
 
   __ bind(&exponent_63_plus);
   // Exponent negative or 63+.
@@ skipping 3561 matching lines @@
 }
 
 #endif
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64