Remove parent_level field of function type parameters.

runtime/vm/stub_code_x64.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/globals.h"
 #if defined(TARGET_ARCH_X64)
 
 #include "vm/assembler.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
@@ skipping 1751 matching lines @@
   // RDX: SubtypeTestCache.
   __ movq(RDX, FieldAddress(RDX, SubtypeTestCache::cache_offset()));
   __ addq(RDX, Immediate(Array::data_offset() - kHeapObjectTag));
   // RDX: Entry start.
   // R10: instance class id.
   // R13: instance type arguments (still null if closure).
   Label loop, found, not_found, next_iteration;
   __ SmiTag(R10);
   __ cmpq(R10, Immediate(Smi::RawValue(kClosureCid)));
   __ j(NOT_EQUAL, &loop, Assembler::kNearJump);
-  __ movq(R13, FieldAddress(RAX, Closure::instantiator_offset()));
+  __ movq(R13, FieldAddress(RAX, Closure::function_type_arguments_offset()));
+  __ cmpq(R13, R9);  // Cache cannot be used for generic closures.
+  __ j(NOT_EQUAL, &not_found, Assembler::kNearJump);
+  __ movq(R13,
+          FieldAddress(RAX, Closure::instantiator_type_arguments_offset()));
   __ movq(R10, FieldAddress(RAX, Closure::function_offset()));
   // R10: instance class id as Smi or function.
   __ Bind(&loop);
   __ movq(RDI, Address(RDX, kWordSize *
                                 SubtypeTestCache::kInstanceClassIdOrFunction));
   __ cmpq(RDI, R9);
   __ j(EQUAL, &not_found, Assembler::kNearJump);
   __ cmpq(RDI, R10);
   if (n == 1) {
     __ j(EQUAL, &found, Assembler::kNearJump);
@@ skipping 511 matching lines @@
 }
 
 
 void StubCode::GenerateAsynchronousGapMarkerStub(Assembler* assembler) {
   __ int3();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_X64