[runtime] Drop FIRST/LAST_NONCALLABLE_SPEC_OBJECT instance type range.

src/full-codegen/ia32/full-codegen-ia32.cc

Index: src/full-codegen/ia32/full-codegen-ia32.cc
diff --git a/src/full-codegen/ia32/full-codegen-ia32.cc b/src/full-codegen/ia32/full-codegen-ia32.cc
index 4c019a27684e73b5e4dca4296af794b1d7d015c7..06e43301000c6f77341a4c4a1e265ed097f29e78 100644
--- a/src/full-codegen/ia32/full-codegen-ia32.cc
+++ b/src/full-codegen/ia32/full-codegen-ia32.cc
@@ -3203,49 +3203,40 @@ void FullCodeGenerator::EmitClassOf(CallRuntime* expr) {
 
   VisitForAccumulatorValue(args->at(0));
 
-  // If the object is a smi, we return null.
-  __ JumpIfSmi(eax, &null);
-
-  // Check that the object is a JS object but take special care of JS
-  // functions to make sure they have 'Function' as their class.
-  // Assume that there are only two callable types, and one of them is at
-  // either end of the type range for JS object types. Saves extra comparisons.
-  STATIC_ASSERT(NUM_OF_CALLABLE_SPEC_OBJECT_TYPES == 2);
+  // If the object is not a JSReceiver, we return null.
+  __ JumpIfSmi(eax, &null, Label::kNear);
+  STATIC_ASSERT(LAST_JS_RECEIVER_TYPE == LAST_TYPE);
   __ CmpObjectType(eax, FIRST_JS_RECEIVER_TYPE, eax);
-  // Map is now in eax.
-  __ j(below, &null);
+  __ j(below, &null, Label::kNear);
 
-  __ CmpInstanceType(eax, LAST_JS_RECEIVER_TYPE);
-  STATIC_ASSERT(LAST_NONCALLABLE_SPEC_OBJECT_TYPE ==
-                LAST_JS_RECEIVER_TYPE - 1);
-  __ j(equal, &function);
-  // Assume that there is no larger type.
-  STATIC_ASSERT(LAST_NONCALLABLE_SPEC_OBJECT_TYPE == LAST_TYPE - 1);
+  // Return 'Function' for JSFunction objects.
+  __ CmpInstanceType(eax, JS_FUNCTION_TYPE);
+  __ j(equal, &function, Label::kNear);
 
   // Check if the constructor in the map is a JS function.
   __ GetMapConstructor(eax, eax, ebx);
   __ CmpInstanceType(ebx, JS_FUNCTION_TYPE);
-  __ j(not_equal, &non_function_constructor);
+  __ j(not_equal, &non_function_constructor, Label::kNear);
 
   // eax now contains the constructor function. Grab the
   // instance class name from there.
   __ mov(eax, FieldOperand(eax, JSFunction::kSharedFunctionInfoOffset));
   __ mov(eax, FieldOperand(eax, SharedFunctionInfo::kInstanceClassNameOffset));
-  __ jmp(&done);
+  __ jmp(&done, Label::kNear);
+
+  // Non-JS objects have class null.
+  __ bind(&null);
+  __ mov(eax, isolate()->factory()->null_value());
+  __ jmp(&done, Label::kNear);
 
   // Functions have class 'Function'.
   __ bind(&function);
   __ mov(eax, isolate()->factory()->Function_string());
-  __ jmp(&done);
+  __ jmp(&done, Label::kNear);
 
   // Objects with a non-function constructor have class 'Object'.
   __ bind(&non_function_constructor);
   __ mov(eax, isolate()->factory()->Object_string());
-  __ jmp(&done);
-
-  // Non-JS objects have class null.
-  __ bind(&null);
-  __ mov(eax, isolate()->factory()->null_value());
 
   // All done.
   __ bind(&done);