Fixed bug in x64 port of KeyedStoreIC::GenerateExternalArray where it

was always falling through to the runtime. Re-examined both load and
store ICs and verified they are now in sync with the 32-bit port.

Ran tests and benchmarks.

Review URL: http://codereview.chromium.org/385020

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@3286 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

src/x64/ic-x64.cc

@@ -790,6 +790,8 @@ void KeyedStoreIC::GenerateExternalArray(MacroAssembler* masm,
   // top of FPU stack: value
   if (array_type == kExternalFloatArray) {
     __ fstp_s(Operand(rcx, rbx, times_4, 0));
+    __ movq(rax, rdx);  // Return the original value.
+    __ ret(0);
   } else {
     // Need to perform float-to-int conversion.
     // Test the top of the FP stack for NaN.