Do not leak message object beyond try-catch.

src/x87/full-codegen-x87.cc

Index: src/x87/full-codegen-x87.cc
diff --git a/src/x87/full-codegen-x87.cc b/src/x87/full-codegen-x87.cc
index 93878fea7e585311f2de9ffd65558997e84b7470..fffb4b27a76fc1a81482c3ff3470e0f772a6ac4a 100644
--- a/src/x87/full-codegen-x87.cc
+++ b/src/x87/full-codegen-x87.cc
@@ -5269,6 +5269,8 @@ void FullCodeGenerator::EnterFinallyBlock() {
       ExternalReference::address_of_pending_message_obj(isolate());
   __ mov(edx, Operand::StaticVariable(pending_message_obj));
   __ push(edx);
+
+  ClearPendingMessage();
 }
 
 
@@ -5291,6 +5293,15 @@ void FullCodeGenerator::ExitFinallyBlock() {
 }
 
 
+void FullCodeGenerator::ClearPendingMessage() {
+  DCHECK(!result_register().is(edx));
+  ExternalReference pending_message_obj =
+      ExternalReference::address_of_pending_message_obj(isolate());
+  __ mov(edx, Immediate(isolate()->factory()->the_hole_value()));
+  __ mov(Operand::StaticVariable(pending_message_obj), edx);
+}
+
+
 #undef __