[stubs] Introduce a dedicated FastNewObjectStub.

src/ia32/macro-assembler-ia32.cc

Index: src/ia32/macro-assembler-ia32.cc
diff --git a/src/ia32/macro-assembler-ia32.cc b/src/ia32/macro-assembler-ia32.cc
index 2a5c696913f8b9afe95a4be4d0488c9e56b22054..12daec8285c79fea84149f25660fb1f593978118 100644
--- a/src/ia32/macro-assembler-ia32.cc
+++ b/src/ia32/macro-assembler-ia32.cc
@@ -954,6 +954,19 @@ void MacroAssembler::AssertBoundFunction(Register object) {
 }
 
 
+void MacroAssembler::AssertReceiver(Register object) {
+  if (emit_debug_code()) {
+    test(object, Immediate(kSmiTagMask));
+    Check(not_equal, kOperandIsASmiAndNotAReceiver);
+    Push(object);
+    STATIC_ASSERT(LAST_TYPE == LAST_JS_RECEIVER_TYPE);
+    CmpObjectType(object, FIRST_JS_RECEIVER_TYPE, object);
+    Pop(object);
+    Check(above_equal, kOperandIsNotAReceiver);
+  }
+}
+
+
 void MacroAssembler::AssertUndefinedOrAllocationSite(Register object) {
   if (emit_debug_code()) {
     Label done_checking;