Fix the receiver check in the HandleFastApiCall builtin.

src/ia32/builtins-ia32.cc

Index: src/ia32/builtins-ia32.cc
diff --git a/src/ia32/builtins-ia32.cc b/src/ia32/builtins-ia32.cc
index 66b9627cde64f1dcdee6392f3910bd5625c56c5f..a2aec741621587eb201d6880572eb9147fb2d1c4 100644
--- a/src/ia32/builtins-ia32.cc
+++ b/src/ia32/builtins-ia32.cc
@@ -2348,17 +2348,10 @@ static void CompatibleReceiverCheck(MacroAssembler* masm, Register receiver,
   __ j(equal, &receiver_check_passed, Label::kNear);
 
   // Walk the prototype chain.
+  __ mov(scratch0, FieldOperand(receiver, HeapObject::kMapOffset));
   Label prototype_loop_start;
   __ bind(&prototype_loop_start);
 
-  // End if receiver is null or if it's a hidden prototype.
-  __ CompareRoot(receiver, Heap::kNullValueRootIndex);
-  __ j(equal, receiver_check_failed, Label::kNear);
-  __ mov(scratch0, FieldOperand(receiver, HeapObject::kMapOffset));
-  __ test(FieldOperand(scratch0, Map::kBitField3Offset),
-          Immediate(Map::IsHiddenPrototype::kMask));
-  __ j(not_zero, receiver_check_failed, Label::kNear);
-
   // Get the constructor, if any.
   __ GetMapConstructor(scratch0, scratch0, scratch1);
   __ CmpInstanceType(scratch1, JS_FUNCTION_TYPE);
@@ -2391,10 +2384,18 @@ static void CompatibleReceiverCheck(MacroAssembler* masm, Register receiver,
          FieldOperand(scratch0, FunctionTemplateInfo::kParentTemplateOffset));
   __ jmp(&function_template_loop, Label::kNear);
 
-  // Load the next prototype and iterate.
+  // Load the next prototype.
   __ bind(&next_prototype);
   __ mov(receiver, FieldOperand(receiver, HeapObject::kMapOffset));
   __ mov(receiver, FieldOperand(receiver, Map::kPrototypeOffset));
+  // End if the prototype is null or not hidden.
+  __ CompareRoot(receiver, Heap::kNullValueRootIndex);
+  __ j(equal, receiver_check_failed);
+  __ mov(scratch0, FieldOperand(receiver, HeapObject::kMapOffset));
+  __ test(FieldOperand(scratch0, Map::kBitField3Offset),
+          Immediate(Map::IsHiddenPrototype::kMask));
+  __ j(zero, receiver_check_failed);
+  // Iterate.
   __ jmp(&prototype_loop_start, Label::kNear);
 
   __ bind(&receiver_check_passed);