Do not leak message object beyond try-catch.

src/arm64/full-codegen-arm64.cc

 // Copyright 2013 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"
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
@@ skipping 5345 matching lines @@
   __ Sub(x10, lr, Operand(masm_->CodeObject()));
   __ SmiTag(x10);
   __ Push(result_register(), x10);
 
   // Store pending message while executing finally block.
   ExternalReference pending_message_obj =
       ExternalReference::address_of_pending_message_obj(isolate());
   __ Mov(x10, pending_message_obj);
   __ Ldr(x10, MemOperand(x10));
   __ Push(x10);
+
+  ClearPendingMessage();
 }
 
 
 void FullCodeGenerator::ExitFinallyBlock() {
   ASM_LOCATION("FullCodeGenerator::ExitFinallyBlock");
   DCHECK(!result_register().is(x10));
 
   // Restore pending message from stack.
   __ Pop(x10);
   ExternalReference pending_message_obj =
       ExternalReference::address_of_pending_message_obj(isolate());
   __ Mov(x13, pending_message_obj);
   __ Str(x10, MemOperand(x13));
 
   // Restore result register and cooked return address from the stack.
   __ Pop(x10, result_register());
 
   // Uncook the return address (see EnterFinallyBlock).
   __ SmiUntag(x10);
   __ Add(x11, x10, Operand(masm_->CodeObject()));
   __ Br(x11);
 }
 
 
+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 __
 
 
 void BackEdgeTable::PatchAt(Code* unoptimized_code,
                             Address pc,
                             BackEdgeState target_state,
                             Code* replacement_code) {
   // Turn the jump into a nop.
   Address branch_address = pc - 3 * kInstructionSize;
   PatchingAssembler patcher(branch_address, 1);
@@ skipping 81 matching lines @@
     }
   }
 
   return INTERRUPT;
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_ARM64