Another x64 build fix. Actually builds now.

KExponentBits -> kExponentBits.

TBR=erik.corry@gmail.com

Review URL: http://codereview.chromium.org/2835001

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@4859 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/x64/codegen-x64.cc

@@ -8369,7 +8369,7 @@ void IntegerConvert(MacroAssembler* masm,
   // 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));