Remove signature classes from the VM.

runtime/vm/stub_code_mips.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_MIPS)
 
 #include "vm/assembler.h"
 #include "vm/code_generator.h"
 #include "vm/compiler.h"
@@ skipping 1925 matching lines @@
   __ AddImmediate(T2, Array::data_offset() - kHeapObjectTag);
 
   __ LoadObject(T7, Object::null_object());
 
   Label loop, found, not_found, next_iteration;
   // T0: instance class id.
   // T1: instance type arguments.
   // T2: Entry start.
   // T7: null.
   __ SmiTag(T0);
+  __ BranchNotEqual(T0, Immediate(Smi::RawValue(kClosureCid)), &loop);
+  __ lw(T0, FieldAddress(A0, Closure::function_offset()));
+  // T0: instance class id as Smi or function.
   __ Bind(&loop);
-  __ lw(T3, Address(T2, kWordSize * SubtypeTestCache::kInstanceClassId));
+  __ lw(T3,
+        Address(T2, kWordSize * SubtypeTestCache::kInstanceClassIdOrFunction));
   __ beq(T3, T7, &not_found);
 
   if (n == 1) {
     __ beq(T3, T0, &found);
   } else {
     __ bne(T3, T0, &next_iteration);
     __ lw(T3,
           Address(T2, kWordSize * SubtypeTestCache::kInstanceTypeArguments));
     if (n == 2) {
       __ beq(T3, T1, &found);
@@ skipping 344 matching lines @@
   __ Bind(&miss);
   __ LoadIsolate(T2);
   __ lw(CODE_REG, Address(T2, Isolate::ic_miss_code_offset()));
   __ lw(T1, FieldAddress(CODE_REG, Code::entry_point_offset()));
   __ Ret();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_MIPS