git: openjdk/mobile: 8196969: JTreg Failure: serviceability/sa/ClhsdbJstack.java causes NPE

[duke]

Changeset: c4f5c4fe
Author:    Severin Gehwolf <sgehwolf at openjdk.org>
Date:      2019-09-23 20:26:18 +0000
URL:       https://git.openjdk.java.net/mobile/commit/c4f5c4fe

8196969: JTreg Failure: serviceability/sa/ClhsdbJstack.java causes NPE

Account for serialized null scopes in NMethod

Reviewed-by: aph, never

! src/jdk.hotspot.agent/share/classes/sun/jvm/hotspot/code/NMethod.java
+ test/hotspot/jtreg/serviceability/sa/ClhsdbJstackXcompStress.java
+ test/hotspot/jtreg/serviceability/sa/LingeredAppWithRecComputation.java