PPC: [runtime] Drop FIRST/LAST_NONCALLABLE_SPEC_OBJECT instance type range.

src/full-codegen/ppc/full-codegen-ppc.cc

Index: src/full-codegen/ppc/full-codegen-ppc.cc
diff --git a/src/full-codegen/ppc/full-codegen-ppc.cc b/src/full-codegen/ppc/full-codegen-ppc.cc
index 1433aa4a76c136838a90448ff6f88145cd3e3985..89b1a7277f5e80dd98d825ca8cb7064464876d54 100644
--- a/src/full-codegen/ppc/full-codegen-ppc.cc
+++ b/src/full-codegen/ppc/full-codegen-ppc.cc
@@ -3321,23 +3321,16 @@ void FullCodeGenerator::EmitClassOf(CallRuntime* expr) {
 
   VisitForAccumulatorValue(args->at(0));
 
-  // If the object is a smi, we return null.
+  // If the object is not a JSReceiver, we return null.
   __ JumpIfSmi(r3, &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);
+  STATIC_ASSERT(LAST_JS_RECEIVER_TYPE == LAST_TYPE);
   __ CompareObjectType(r3, r3, r4, FIRST_JS_RECEIVER_TYPE);
   // Map is now in r3.
   __ blt(&null);
 
-  __ cmpi(r4, Operand(LAST_JS_RECEIVER_TYPE));
-  STATIC_ASSERT(LAST_NONCALLABLE_SPEC_OBJECT_TYPE == LAST_JS_RECEIVER_TYPE - 1);
+  // Return 'Function' for JSFunction objects.
+  __ cmpi(r4, Operand(JS_FUNCTION_TYPE));
   __ beq(&function);
-  // Assume that there is no larger type.
-  STATIC_ASSERT(LAST_NONCALLABLE_SPEC_OBJECT_TYPE == LAST_TYPE - 1);
 
   // Check if the constructor in the map is a JS function.
   Register instance_type = r5;