Do not leak message object beyond try-catch.

src/full-codegen.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "src/v8.h"
 
 #include "src/ast.h"
 #include "src/ast-numbering.h"
 #include "src/code-factory.h"
 #include "src/codegen.h"
@@ skipping 1164 matching lines @@
   SetStatementPosition(stmt);
   // The try block adds a handler to the exception handler chain before
   // entering, and removes it again when exiting normally.  If an exception
   // is thrown during execution of the try block, the handler is consumed
   // and control is passed to the catch block with the exception in the
   // result register.
 
   Label try_entry, handler_entry, exit;
   __ jmp(&try_entry);
   __ bind(&handler_entry);
+
+  ClearPendingMessage();
   // Exception handler code, the exception is in the result register.
   // Extend the context before executing the catch block.
   { Comment cmnt(masm_, "[ Extend catch context");
     __ Push(stmt->variable()->name());
     __ Push(result_register());
     PushFunctionArgumentForContextAllocation();
     __ CallRuntime(Runtime::kPushCatchContext, 3);
     StoreToFrameField(StandardFrameConstants::kContextOffset,
                       context_register());
   }
@@ skipping 440 matching lines @@
   }
   codegen_->PrepareForBailoutForId(exit_id_, NO_REGISTERS);
   codegen_->scope_ = saved_scope_;
 }
 
 
 #undef __
 
 
 } }  // namespace v8::internal