X64 Win64: Reimplement fmod so that it works.

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index 9eeffd10c0f1097d60226c3753d402c101fcc422..5771e4c0f64fb8513fad4c0a971510b3eea2c2dd 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -3747,9 +3747,12 @@ static Object* Runtime_NumberMod(Arguments args) {
   // dividend is finite and divisor is an infinity => result equals dividend
   // dividend is a zero and divisor is nonzero finite => result equals dividend
   if (!(isfinite(x) && (!isfinite(y) && !isnan(y))) &&
-      !(x == 0 && (y != 0 && isfinite(y))))
-#endif
+      !(x == 0 && (y != 0 && isfinite(y)))) {
+    x = fmod(x, y);
+  }
+#else
   x = fmod(x, y);
+#endif
   // NewNumberFromDouble may return a Smi instead of a Number object
   return Heap::NewNumberFromDouble(x);
 }
@@ -4364,6 +4367,12 @@ static Object* Runtime_NewArgumentsFast(Arguments args) {
 }
 
 
+static Object* Runtime_AllocateHeapNumber(Arguments args) {
+  ASSERT_EQ(0, args.length());
+  return Heap::AllocateHeapNumber(0.0);
+}
+
+
 static Object* Runtime_NewClosure(Arguments args) {
   HandleScope scope;
   ASSERT(args.length() == 2);