X64/Win64: Alternative implementation of fmod in general.

src/platform-nullos.cc

Index: src/platform-nullos.cc
diff --git a/src/platform-nullos.cc b/src/platform-nullos.cc
index c0cf7f4b75f3e189a4de0e4925f5d93e63d2d7ee..084880e39444ff254495d18e7bd4f40751889d53 100644
--- a/src/platform-nullos.cc
+++ b/src/platform-nullos.cc
@@ -47,6 +47,13 @@ double ceiling(double x) {
 }
 
 
+// Give V8 the opportunity to override the default fmod behavior.
+double modulo(double x, double y) {
+  UNIMPLEMENTED();
+  return 0;
+}
+
+
 // Initialize OS class early in the V8 startup.
 void OS::Setup() {
   // Seed the random number generator.