Implement ICs for FastDoubleArray loads and stores

src/objects-inl.h

Index: src/objects-inl.h
diff --git a/src/objects-inl.h b/src/objects-inl.h
index eb537c75a05b301c7a6aedfc5b31243c1259e89d..7fb46d07c77f14355bd8691a1d8bbdbb1f11b9b3 100644
--- a/src/objects-inl.h
+++ b/src/objects-inl.h
@@ -1610,6 +1610,21 @@ void FixedArray::set(int index, Object* value) {
 }
 
 
+inline bool FixedDoubleArray::is_the_hole_nan(double value) {
+  return BitCast<uint64_t, double>(value) == kHoleNanInt64;
+}
+
+
+inline double FixedDoubleArray::hole_nan_as_double() {
+  return BitCast<double, uint64_t>(kHoleNanInt64);
+}
+
+
+inline double FixedDoubleArray::canonical_not_the_hole_nan_as_double() {
+  return BitCast<double, uint64_t>(kCanonicalNonHoleNanInt64);
+}
+
+
 double FixedDoubleArray::get(int index) {
   ASSERT(map() != HEAP->fixed_cow_array_map() &&
          map() != HEAP->fixed_array_map());