Add support for interrupting an isolate in the vm. Interrupts are

runtime/vm/opt_code_generator_ia32.cc

 // Copyright (c) 2011, 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"  // Needed here to get TARGET_ARCH_IA32.
 #if defined(TARGET_ARCH_IA32)
 
 #include "vm/opt_code_generator.h"
 
 #include "vm/assembler_macros.h"
@@ skipping 377 matching lines @@
   }
   return false;
 }
 
 
 // Check for stack overflow.
 // Note that first 5 bytes may be patched with a jump.
 // TODO(srdjan): Add check that no object is inlined in the first
 // 5 bytes (length of a jump instruction).
 void OptimizingCodeGenerator::GeneratePreEntryCode() {
-  __ cmpl(ESP,
-      Address::Absolute(Isolate::Current()->stack_limit_address()));
-  __ j(BELOW_EQUAL, &StubCode::StackOverflowLabel());
 }
 
 
 void OptimizingCodeGenerator::CallDeoptimize(intptr_t node_id,
                                              intptr_t token_index) {
   __ call(&StubCode::DeoptimizeLabel());
   AddCurrentDescriptor(PcDescriptors::kOther, node_id, token_index);
 #if defined(DEBUG)
   __ int3();
 #endif
@@ skipping 2184 matching lines @@
   if (IsResultNeeded(node)) {
     // The result is the input value.
     __ pushl(EAX);
   }
 }
 
 
 }  // namespace dart
 
 #endif  // defined TARGET_ARCH_IA32