X87: [builtins] Migrate Number constructor similar to String constructor.

src/x87/macro-assembler-x87.cc

Index: src/x87/macro-assembler-x87.cc
diff --git a/src/x87/macro-assembler-x87.cc b/src/x87/macro-assembler-x87.cc
index 7dbbce4406a7d54fbdb69ffbc2f167189b7004b5..7a0beb57bc7e3617e1d1881afbe2014ec7eafb12 100644
--- a/src/x87/macro-assembler-x87.cc
+++ b/src/x87/macro-assembler-x87.cc
@@ -1642,6 +1642,27 @@ void MacroAssembler::AllocateOneByteSlicedString(Register result,
 }
 
 
+void MacroAssembler::AllocateJSValue(Register result, Register constructor,
+                                     Register value, Register scratch,
+                                     Label* gc_required) {
+  DCHECK(!result.is(constructor));
+  DCHECK(!result.is(scratch));
+  DCHECK(!result.is(value));
+
+  // Allocate JSValue in new space.
+  Allocate(JSValue::kSize, result, scratch, no_reg, gc_required, TAG_OBJECT);
+
+  // Initialize the JSValue.
+  LoadGlobalFunctionInitialMap(constructor, scratch);
+  mov(FieldOperand(result, HeapObject::kMapOffset), scratch);
+  LoadRoot(scratch, Heap::kEmptyFixedArrayRootIndex);
+  mov(FieldOperand(result, JSObject::kPropertiesOffset), scratch);
+  mov(FieldOperand(result, JSObject::kElementsOffset), scratch);
+  mov(FieldOperand(result, JSValue::kValueOffset), value);
+  STATIC_ASSERT(JSValue::kSize == 4 * kPointerSize);
+}
+
+
 // Copy memory, byte-by-byte, from source to destination.  Not optimized for
 // long or aligned copies.  The contents of scratch and length are destroyed.
 // Source and destination are incremented by length.