Do not leak message object beyond try-catch.

src/mips64/full-codegen-mips64.cc

Index: src/mips64/full-codegen-mips64.cc
diff --git a/src/mips64/full-codegen-mips64.cc b/src/mips64/full-codegen-mips64.cc
index b253ed8b3954b4fada10f38633bf48480e12e41b..65c4689fa868ecd6816f2ed608382cff1dda60c3 100644
--- a/src/mips64/full-codegen-mips64.cc
+++ b/src/mips64/full-codegen-mips64.cc
@@ -5356,6 +5356,8 @@ void FullCodeGenerator::EnterFinallyBlock() {
   __ li(at, Operand(pending_message_obj));
   __ ld(a1, MemOperand(at));
   __ push(a1);
+
+  ClearPendingMessage();
 }
 
 
@@ -5380,6 +5382,16 @@ void FullCodeGenerator::ExitFinallyBlock() {
 }
 
 
+void FullCodeGenerator::ClearPendingMessage() {
+  DCHECK(!result_register().is(a1));
+  ExternalReference pending_message_obj =
+      ExternalReference::address_of_pending_message_obj(isolate());
+  __ LoadRoot(a1, Heap::kTheHoleValueRootIndex);
+  __ li(at, Operand(pending_message_obj));
+  __ sd(a1, MemOperand(at));
+}
+
+
 #undef __