Do not leak message object beyond try-catch.

src/arm64/full-codegen-arm64.cc

Index: src/arm64/full-codegen-arm64.cc
diff --git a/src/arm64/full-codegen-arm64.cc b/src/arm64/full-codegen-arm64.cc
index 632ec5f44ed7236216dc699f340cfebc67bcd97d..171765dd02f9c9f3b2657070c1fe7ae38c29c11a 100644
--- a/src/arm64/full-codegen-arm64.cc
+++ b/src/arm64/full-codegen-arm64.cc
@@ -5363,6 +5363,8 @@ void FullCodeGenerator::EnterFinallyBlock() {
   __ Mov(x10, pending_message_obj);
   __ Ldr(x10, MemOperand(x10));
   __ Push(x10);
+
+  ClearPendingMessage();
 }
 
 
@@ -5387,6 +5389,16 @@ void FullCodeGenerator::ExitFinallyBlock() {
 }
 
 
+void FullCodeGenerator::ClearPendingMessage() {
+  DCHECK(!result_register().is(x10));
+  ExternalReference pending_message_obj =
+      ExternalReference::address_of_pending_message_obj(isolate());
+  __ LoadRoot(x10, Heap::kTheHoleValueRootIndex);
+  __ Mov(x13, pending_message_obj);
+  __ Str(x10, MemOperand(x13));
+}
+
+
 #undef __