Do not leak message object beyond try-catch.

src/mips/full-codegen-mips.cc

Index: src/mips/full-codegen-mips.cc
diff --git a/src/mips/full-codegen-mips.cc b/src/mips/full-codegen-mips.cc
index 67ec571296af847d2c6d63f1b967803d5cb764e0..38a7db97e83aebda278cbe0ba2ef9c1ae18d4d7a 100644
--- a/src/mips/full-codegen-mips.cc
+++ b/src/mips/full-codegen-mips.cc
@@ -5377,6 +5377,16 @@ void FullCodeGenerator::ExitFinallyBlock() {
 }
 
 
+void FullCodeGenerator::EnterCatchBlock() {
+  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));
+  __ sw(a1, MemOperand(at));
+}
+
+
 #undef __