[runtime] Drop FIRST/LAST_NONCALLABLE_SPEC_OBJECT instance type range.

src/crankshaft/x64/lithium-codegen-x64.cc

Index: src/crankshaft/x64/lithium-codegen-x64.cc
diff --git a/src/crankshaft/x64/lithium-codegen-x64.cc b/src/crankshaft/x64/lithium-codegen-x64.cc
index 03c047d4e3da50805536f1f90e072f2704a4cea7..4a8c85846bb29126b91c43954032d1e55a92394a 100644
--- a/src/crankshaft/x64/lithium-codegen-x64.cc
+++ b/src/crankshaft/x64/lithium-codegen-x64.cc
@@ -2498,29 +2498,13 @@ void LCodeGen::EmitClassOfTest(Label* is_true,
 
   __ JumpIfSmi(input, is_false);
 
+  __ CmpObjectType(input, JS_FUNCTION_TYPE, temp);
   if (String::Equals(isolate()->factory()->Function_string(), class_name)) {
-    // Assuming the following assertions, we can use the same compares to test
-    // for both being a function type and being in the object type range.
-    STATIC_ASSERT(NUM_OF_CALLABLE_SPEC_OBJECT_TYPES == 2);
-    STATIC_ASSERT(LAST_NONCALLABLE_SPEC_OBJECT_TYPE ==
-                  LAST_JS_RECEIVER_TYPE - 1);
-    STATIC_ASSERT(LAST_JS_RECEIVER_TYPE == LAST_TYPE);
-    __ CmpObjectType(input, FIRST_JS_RECEIVER_TYPE, temp);
-    __ j(below, is_false);
-    __ CmpInstanceType(temp, LAST_JS_RECEIVER_TYPE);
     __ j(equal, is_true);
   } else {
-    // Faster code path to avoid two compares: subtract lower bound from the
-    // actual type and do a signed compare with the width of the type range.
-    __ movp(temp, FieldOperand(input, HeapObject::kMapOffset));
-    __ movzxbl(temp2, FieldOperand(temp, Map::kInstanceTypeOffset));
-    __ subp(temp2, Immediate(FIRST_JS_RECEIVER_TYPE));
-    __ cmpp(temp2, Immediate(LAST_NONCALLABLE_SPEC_OBJECT_TYPE -
-                             FIRST_JS_RECEIVER_TYPE));
-    __ j(above, is_false);
+    __ j(equal, is_false);
   }
 
-  // Now we are in the FIRST-LAST_NONCALLABLE_SPEC_OBJECT_TYPE range.
   // Check if the constructor in the map is a function.
   __ GetMapConstructor(temp, temp, kScratchRegister);