Introduce intrinsics for double values in Javascript.

src/runtime.h

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 171 matching lines @@
   F(Math_log1p, 1, 1) \
   F(Math_expm1, 1, 1) \
   F(Math_sqrt, 1, 1) \
   F(Math_exp, 1, 1) \
   F(Math_floor, 1, 1) \
   F(Math_pow, 2, 1) \
   F(Math_pow_cfunction, 2, 1) \
   F(Math_atan2, 2, 1) \
   F(RoundNumber, 1, 1) \
   F(Math_fround, 1, 1) \
+  F(DoubleHi, 1, 1) \
+  F(DoubleLo, 1, 1) \
+  F(ConstructDouble, 2, 1) \
   \
   /* Regular expressions */ \
   F(RegExpCompile, 3, 1) \
   F(RegExpExec, 4, 1) \
   F(RegExpExecMultiple, 4, 1) \
   F(RegExpInitializeObject, 5, 1) \
   F(RegExpConstructResult, 3, 1) \
   \
   /* JSON */ \
   F(ParseJson, 1, 1) \
@@ skipping 458 matching lines @@
 #define INLINE_RUNTIME_FUNCTION_LIST(F) \
   F(ClassOf, 1, 1)                                                           \
   F(StringCharCodeAt, 2, 1)                                                  \
   F(Log, 3, 1)                                                               \
   F(StringAdd, 2, 1)                                                         \
   F(SubString, 3, 1)                                                         \
   F(StringCompare, 2, 1)                                                     \
   F(RegExpExec, 4, 1)                                                        \
   F(RegExpConstructResult, 3, 1)                                             \
   F(GetFromCache, 2, 1)                                                      \
-  F(NumberToString, 1, 1)
+  F(NumberToString, 1, 1)                                                    \
+  F(DoubleHi, 1, 1)                                                          \
+  F(DoubleLo, 1, 1)                                                          \
+  F(ConstructDouble, 2, 1)
 
 
 //---------------------------------------------------------------------------
 // Runtime provides access to all C++ runtime functions.
 
 class RuntimeState {
  public:
   StaticResource<ConsStringIteratorOp>* string_iterator() {
     return &string_iterator_;
   }
@@ skipping 193 matching lines @@
 class AllocateDoubleAlignFlag:    public BitField<bool,            0, 1> {};
 class AllocateTargetSpace:        public BitField<AllocationSpace, 1, 3> {};
 
 class DeclareGlobalsEvalFlag:     public BitField<bool,         0, 1> {};
 class DeclareGlobalsNativeFlag:   public BitField<bool,         1, 1> {};
 class DeclareGlobalsLanguageMode: public BitField<LanguageMode, 2, 2> {};
 
 } }  // namespace v8::internal
 
 #endif  // V8_RUNTIME_H_