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

src/compiler.h

 // 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 181 matching lines @@
     if (current_code->is_compiled_optimizable()) {
       EnableDeoptimizationSupport();
     } else {
       mode_ = CompilationInfo::NONOPT;
     }
   }
   bool IsCompilingForDebugging() {
     return IsCompilingForDebugging::decode(flags_);
   }
 
+  bool ShouldTrapOnDeopt() const {
+    return (FLAG_trap_on_deopt && IsOptimizing()) ||
+        (FLAG_trap_on_stub_deopt && IsStub());
+  }
+
   bool has_global_object() const {
     return !closure().is_null() &&
         (closure()->context()->global_object() != NULL);
   }
 
   GlobalObject* global_object() const {
     return has_global_object() ? closure()->context()->global_object() : NULL;
   }
 
   // Accessors for the different compilation modes.
@@ skipping 424 matching lines @@
   unsigned info_zone_start_allocation_size_;
   int64_t start_ticks_;
 
   DISALLOW_COPY_AND_ASSIGN(CompilationPhase);
 };
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_COMPILER_H_