fdlibm: reduce accuracy slightly in favor of performance.

src/runtime.cc

Index: src/runtime.cc
diff --git a/src/runtime.cc b/src/runtime.cc
index 28d24d5ed07ff174ed64df13dee3ebe24a6ca555..751050b988c4de462966ac0681b00f1913c72773 100644
--- a/src/runtime.cc
+++ b/src/runtime.cc
@@ -7779,12 +7779,11 @@ RUNTIME_FUNCTION(Runtime_RemPiO2) {
   ASSERT(args.length() == 1);
   CONVERT_DOUBLE_ARG_CHECKED(x, 0);
   Factory* factory = isolate->factory();
-  double y[2];
-  int n = rempio2(x, y);
-  Handle<FixedArray> array = factory->NewFixedArray(3);
+  double y;
+  int n = rempio2(x, &y);
+  Handle<FixedArray> array = factory->NewFixedArray(2);
   array->set(0, Smi::FromInt(n));
-  array->set(1, *factory->NewHeapNumber(y[0]));
-  array->set(2, *factory->NewHeapNumber(y[1]));
+  array->set(1, *factory->NewHeapNumber(y));
   return *factory->NewJSArrayWithElements(array);
 }