[runtime] Drop FIRST/LAST_NONCALLABLE_SPEC_OBJECT instance type range.

src/crankshaft/mips64/lithium-codegen-mips64.cc

Index: src/crankshaft/mips64/lithium-codegen-mips64.cc
diff --git a/src/crankshaft/mips64/lithium-codegen-mips64.cc b/src/crankshaft/mips64/lithium-codegen-mips64.cc
index afec004714ca5a24b6342a47d58912c77076f2e2..213e464950758e4d844c84e5c5231e7baf58d49d 100644
--- a/src/crankshaft/mips64/lithium-codegen-mips64.cc
+++ b/src/crankshaft/mips64/lithium-codegen-mips64.cc
@@ -2570,24 +2570,11 @@ void LCodeGen::EmitClassOfTest(Label* is_true,
 
   __ JumpIfSmi(input, is_false);
 
+  __ GetObjectType(input, temp, temp2);
   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);
-
-    __ GetObjectType(input, temp, temp2);
-    __ Branch(is_false, lt, temp2, Operand(FIRST_JS_RECEIVER_TYPE));
-    __ Branch(is_true, eq, temp2, Operand(LAST_JS_RECEIVER_TYPE));
+    __ Branch(is_true, eq, temp2, Operand(JS_FUNCTION_TYPE));
   } 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.
-    __ GetObjectType(input, temp, temp2);
-    __ Dsubu(temp2, temp2, Operand(FIRST_JS_RECEIVER_TYPE));
-    __ Branch(is_false, gt, temp2, Operand(LAST_NONCALLABLE_SPEC_OBJECT_TYPE -
-                                           FIRST_JS_RECEIVER_TYPE));
+    __ Branch(is_false, eq, temp2, Operand(JS_FUNCTION_TYPE));
   }
 
   // Now we are in the FIRST-LAST_NONCALLABLE_SPEC_OBJECT_TYPE range.