Preserve error message during finally block in try..finally.

src/x64/full-codegen-x64.cc

Index: src/x64/full-codegen-x64.cc
diff --git a/src/x64/full-codegen-x64.cc b/src/x64/full-codegen-x64.cc
index 0db7424eb26e79887434efc03101d875cbc7a16c..fb86f2e8de076e89a4a2b020f021b78525fdbbc2 100644
--- a/src/x64/full-codegen-x64.cc
+++ b/src/x64/full-codegen-x64.cc
@@ -4477,6 +4477,26 @@ void FullCodeGenerator::ExitFinallyBlock() {
 }
 
 
+void FullCodeGenerator::SavePendingMessage() {
+  ASSERT(!result_register().is(rdx));
+  // Store pending message while executing finally block upon exception.
+  ExternalReference pending_message_obj =
+      ExternalReference::address_of_pending_message_obj(isolate());
+  __ Load(rdx, pending_message_obj);
+  __ push(rdx);
+}
+
+
+void FullCodeGenerator::RestorePendingMessage() {
+  ASSERT(!result_register().is(rdx));
+  // Restore pending message if cleared by executing the finally block.
+  __ pop(rdx);
+  ExternalReference pending_message_obj =
+      ExternalReference::address_of_pending_message_obj(isolate());
+  __ Store(pending_message_obj, rdx);
+}
+
+
 #undef __
 
 #define __ ACCESS_MASM(masm())