Implement ICs for FastDoubleArray loads and stores

src/objects.h

Index: src/objects.h
diff --git a/src/objects.h b/src/objects.h
index 9765fe2a0ab242f897145ea7d763ea21a8616b27..fe9f1e2c5eb9d01727423025569361954dbf5980 100644
--- a/src/objects.h
+++ b/src/objects.h
@@ -2173,23 +2173,9 @@ class FixedDoubleArray: public FixedArrayBase {
     return kHeaderSize + length * kDoubleSize;
   }
 
-  // The following can't be declared inline as const static
-  // because they're 64-bit.
-  static uint64_t kCanonicalNonHoleNanLower32;
-  static uint64_t kCanonicalNonHoleNanInt64;
-  static uint64_t kHoleNanInt64;
-
-  inline static bool is_the_hole_nan(double value) {
-    return BitCast<uint64_t, double>(value) == kHoleNanInt64;
-  }
-
-  inline static double hole_nan_as_double() {
-    return BitCast<double, uint64_t>(kHoleNanInt64);
-  }
-
-  inline static double canonical_not_the_hole_nan_as_double() {
-    return BitCast<double, uint64_t>(kCanonicalNonHoleNanInt64);
-  }
+  inline static bool is_the_hole_nan(double value);
+  inline static double hole_nan_as_double();
+  inline static double canonical_not_the_hole_nan_as_double();
 
   // Casting.
   static inline FixedDoubleArray* cast(Object* obj);