[builtins] Migrate Number constructor similar to String constructor.

src/x64/macro-assembler-x64.h

Index: src/x64/macro-assembler-x64.h
diff --git a/src/x64/macro-assembler-x64.h b/src/x64/macro-assembler-x64.h
index aefc53f8a2fcaa7ac00ca7c9392a4c0b06808f89..1aa2c74f228984b8db91d3e5decb970b2bc4d727 100644
--- a/src/x64/macro-assembler-x64.h
+++ b/src/x64/macro-assembler-x64.h
@@ -1319,6 +1319,11 @@ class MacroAssembler: public Assembler {
   void AllocateOneByteSlicedString(Register result, Register scratch1,
                                    Register scratch2, Label* gc_required);
 
+  // Allocate and initialize a JSValue wrapper with the specified {constructor}
+  // and {value}.
+  void AllocateJSValue(Register result, Register constructor, Register value,
+                       Register scratch, Label* gc_required);
+
   // ---------------------------------------------------------------------------
   // Support functions.