Revert of [es5] Class of object is "Function" if object has [[Call]].

src/full-codegen/mips64/full-codegen-mips64.cc

Index: src/full-codegen/mips64/full-codegen-mips64.cc
diff --git a/src/full-codegen/mips64/full-codegen-mips64.cc b/src/full-codegen/mips64/full-codegen-mips64.cc
index 54f81199a5b886f7bb778efb1ea3e899b6e23df2..bcd90de71fb43f2e4e311a26964142e70c2e2385 100644
--- a/src/full-codegen/mips64/full-codegen-mips64.cc
+++ b/src/full-codegen/mips64/full-codegen-mips64.cc
@@ -3687,17 +3687,23 @@
   // If the object is a smi, we return null.
   __ JumpIfSmi(v0, &null);
 
-  // If the object is not a receiver, we return null.
-  STATIC_ASSERT(LAST_JS_RECEIVER_TYPE == LAST_TYPE);
+  // 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);
   __ GetObjectType(v0, v0, a1);  // Map is now in v0.
-  __ Branch(&null, lt, a1, Operand(FIRST_JS_RECEIVER_TYPE));
-
-  // According to ES5 section 15 Standard Built-in ECMAScript Objects, the
-  // [[Class]] of builtin objects is "Function" if a [[Call]] internal
-  // method is present.
-  __ lbu(a1, FieldMemOperand(v0, Map::kBitFieldOffset));
-  __ And(a1, a1, Operand(1 << Map::kIsCallable));
-  __ Branch(&function, ne, a1, Operand(zero_reg));
+  __ Branch(&null, lt, a1, Operand(FIRST_SPEC_OBJECT_TYPE));
+
+  STATIC_ASSERT(FIRST_NONCALLABLE_SPEC_OBJECT_TYPE ==
+                FIRST_SPEC_OBJECT_TYPE + 1);
+  __ Branch(&function, eq, a1, Operand(FIRST_SPEC_OBJECT_TYPE));
+
+  STATIC_ASSERT(LAST_NONCALLABLE_SPEC_OBJECT_TYPE ==
+                LAST_SPEC_OBJECT_TYPE - 1);
+  __ Branch(&function, eq, a1, Operand(LAST_SPEC_OBJECT_TYPE));
+  // 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 = a2;