Remove signature classes from the VM.

runtime/vm/stub_code_ia32.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_IA32)
 
 #include "vm/assembler.h"
 #include "vm/compiler.h"
 #include "vm/dart_entry.h"
@@ skipping 1763 matching lines @@
   __ movl(EDX, Address(ESP, kCacheOffsetInBytes));
   // EDX: SubtypeTestCache.
   __ movl(EDX, FieldAddress(EDX, SubtypeTestCache::cache_offset()));
   __ addl(EDX, Immediate(Array::data_offset() - kHeapObjectTag));
 
   Label loop, found, not_found, next_iteration;
   // EDX: Entry start.
   // ECX: instance class id.
   // EBX: instance type arguments.
   __ SmiTag(ECX);
+  __ cmpl(ECX, Immediate(Smi::RawValue(kClosureCid)));
+  __ j(NOT_EQUAL, &loop, Assembler::kNearJump);
+  __ movl(ECX, FieldAddress(EAX, Closure::function_offset()));
+  // ECX: instance class id as Smi or function.
   __ Bind(&loop);
-  __ movl(EDI, Address(EDX, kWordSize * SubtypeTestCache::kInstanceClassId));
+  __ movl(EDI,
+          Address(EDX,
+                  kWordSize * SubtypeTestCache::kInstanceClassIdOrFunction));
   __ cmpl(EDI, raw_null);
   __ j(EQUAL, &not_found, Assembler::kNearJump);
   __ cmpl(EDI, ECX);
   if (n == 1) {
     __ j(EQUAL, &found, Assembler::kNearJump);
   } else {
     __ j(NOT_EQUAL, &next_iteration, Assembler::kNearJump);
     __ movl(EDI,
           Address(EDX, kWordSize * SubtypeTestCache::kInstanceTypeArguments));
     __ cmpl(EDI, EBX);
@@ skipping 285 matching lines @@
 // Result:
 //  EBX: target entry point
 //  EDX: arguments descriptor
 void StubCode::GenerateICLookupStub(Assembler* assembler) {
   __ int3();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32