Add flag trap_on_stub_deopt. We want to be able to trap on hydrogen stub bailouts.

src/ia32/lithium-codegen-ia32.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 986 matching lines @@
   // we can have inputs or outputs of the current instruction on the stack,
   // thus we need to flush them here from the physical stack to leave it in a
   // consistent state.
   if (x87_stack_depth_ > 0) {
     Label done;
     if (cc != no_condition) __ j(NegateCondition(cc), &done, Label::kNear);
     EmitFlushX87ForDeopt();
     __ bind(&done);
   }
 
-  if (FLAG_trap_on_deopt && info()->IsOptimizing()) {
+  if ((FLAG_trap_on_deopt && info()->IsOptimizing()) ||
+      (FLAG_trap_on_stub_deopt && info()->IsStub())) {
     Label done;
     if (cc != no_condition) __ j(NegateCondition(cc), &done, Label::kNear);
     __ int3();
     __ bind(&done);
   }
 
   ASSERT(info()->IsStub() || frame_is_built_);
   if (cc == no_condition && frame_is_built_) {
     __ call(entry, RelocInfo::RUNTIME_ENTRY);
   } else {
@@ skipping 5532 matching lines @@
                               FixedArray::kHeaderSize - kPointerSize));
   __ bind(&done);
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32