[builtins] Migrate Number constructor similar to String constructor.

src/arm64/macro-assembler-arm64.cc

Index: src/arm64/macro-assembler-arm64.cc
diff --git a/src/arm64/macro-assembler-arm64.cc b/src/arm64/macro-assembler-arm64.cc
index bd7b950247cc70a8b9d20189f226494752f3d9df..fbf459db46c4b27308562dcbf75748748b3d2771 100644
--- a/src/arm64/macro-assembler-arm64.cc
+++ b/src/arm64/macro-assembler-arm64.cc
@@ -3269,6 +3269,28 @@ void MacroAssembler::JumpIfObjectType(Register object,
 }
 
 
+void MacroAssembler::AllocateJSValue(Register result, Register constructor,
+                                     Register value, Register scratch1,
+                                     Register scratch2, Label* gc_required) {
+  DCHECK(!result.is(constructor));
+  DCHECK(!result.is(scratch1));
+  DCHECK(!result.is(scratch2));
+  DCHECK(!result.is(value));
+
+  // Allocate JSValue in new space.
+  Allocate(JSValue::kSize, result, scratch1, scratch2, gc_required, TAG_OBJECT);
+
+  // Initialize the JSValue.
+  LoadGlobalFunctionInitialMap(constructor, scratch1, scratch2);
+  Str(scratch1, FieldMemOperand(result, HeapObject::kMapOffset));
+  LoadRoot(scratch1, Heap::kEmptyFixedArrayRootIndex);
+  Str(scratch1, FieldMemOperand(result, JSObject::kPropertiesOffset));
+  Str(scratch1, FieldMemOperand(result, JSObject::kElementsOffset));
+  Str(value, FieldMemOperand(result, JSValue::kValueOffset));
+  STATIC_ASSERT(JSValue::kSize == 4 * kPointerSize);
+}
+
+
 void MacroAssembler::JumpIfNotObjectType(Register object,
                                          Register map,
                                          Register type_reg,