[runtime] Fix ES6 9.2.1 [[Call]] when encountering a classConstructor.

src/mips64/builtins-mips64.cc

Index: src/mips64/builtins-mips64.cc
diff --git a/src/mips64/builtins-mips64.cc b/src/mips64/builtins-mips64.cc
index 389d39be6c824ae1659a696ab04eaa58a13e21cb..6e28f896e2c48a91867986be17a3e6f1525576be 100644
--- a/src/mips64/builtins-mips64.cc
+++ b/src/mips64/builtins-mips64.cc
@@ -1560,8 +1560,24 @@ void Builtins::Generate_CallFunction(MacroAssembler* masm) {
 
   Label convert, convert_global_proxy, convert_to_object, done_convert;
   __ AssertFunction(a1);
-  // TODO(bmeurer): Throw a TypeError if function's [[FunctionKind]] internal
-  // slot is "classConstructor".
+  __ ld(a2, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
+
+  {
+    Label non_class_constructor;
+    // Check whether the current function is a classConstructor
+    __ lbu(a3,
+           FieldMemOperand(a2, SharedFunctionInfo::kFunctionKindByteOffset));
+    __ And(at, a3,
+           Operand(SharedFunctionInfo::kClassConstructorBitsWithinByte));
+    __ Branch(&non_class_constructor, eq, at, Operand(zero_reg));
+    // Step: 2, If we call a classConstructor Function throw a TypeError.
+    {
+      FrameScope frame(masm, StackFrame::INTERNAL);
+      __ CallRuntime(Runtime::kThrowConstructorNonCallableError, 0);
+    }
+    __ bind(&non_class_constructor);
+  }
+
   // Enter the context of the function; ToObject has to run in the function
   // context, and we also need to take the global proxy from the function
   // context in case of conversion.
@@ -1569,7 +1585,6 @@ void Builtins::Generate_CallFunction(MacroAssembler* masm) {
   STATIC_ASSERT(SharedFunctionInfo::kNativeByteOffset ==
                 SharedFunctionInfo::kStrictModeByteOffset);
   __ ld(cp, FieldMemOperand(a1, JSFunction::kContextOffset));
-  __ ld(a2, FieldMemOperand(a1, JSFunction::kSharedFunctionInfoOffset));
   // We need to convert the receiver for non-native sloppy mode functions.
   __ lbu(a3, FieldMemOperand(a2, SharedFunctionInfo::kNativeByteOffset));
   __ And(at, a3, Operand((1 << SharedFunctionInfo::kNativeBitWithinByte) |