Remove signature classes from the VM.

runtime/vm/stub_code_arm.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_ARM)
 
 #include "vm/assembler.h"
 #include "vm/code_generator.h"
 #include "vm/cpu.h"
@@ skipping 1786 matching lines @@
   // R3: instance class id.
   // R4: instance type arguments (null if none), used only if n > 1.
   __ ldr(R2, FieldAddress(R2, SubtypeTestCache::cache_offset()));
   __ AddImmediate(R2, Array::data_offset() - kHeapObjectTag);
 
   Label loop, found, not_found, next_iteration;
   // R2: entry start.
   // R3: instance class id.
   // R4: instance type arguments.
   __ SmiTag(R3);
+  __ CompareImmediate(R3, Smi::RawValue(kClosureCid));
+  __ ldr(R3, FieldAddress(R0, Closure::function_offset()), EQ);
+  // R3: instance class id as Smi or function.
   __ Bind(&loop);
-  __ ldr(R9, Address(R2, kWordSize * SubtypeTestCache::kInstanceClassId));
+  __ ldr(R9,
+         Address(R2, kWordSize * SubtypeTestCache::kInstanceClassIdOrFunction));
   __ CompareObject(R9, Object::null_object());
   __ b(&not_found, EQ);
   __ cmp(R9, Operand(R3));
   if (n == 1) {
     __ b(&found, EQ);
   } else {
     __ b(&next_iteration, NE);
     __ ldr(R9,
            Address(R2, kWordSize * SubtypeTestCache::kInstanceTypeArguments));
     __ cmp(R9, Operand(R4));
@@ skipping 322 matching lines @@
   __ Bind(&miss);
   __ LoadIsolate(R2);
   __ ldr(CODE_REG, Address(R2, Isolate::ic_miss_code_offset()));
   __ ldr(R1, FieldAddress(CODE_REG, Code::entry_point_offset()));
   __ Ret();
 }
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_ARM