hg: jdk/sandbox: 8244733: Add ResourceHashtable::xxx_if_absent

[chris.hegarty at oracle.com]

Changeset: 0c21a8e4fe47
Author:    stuefe
Date:      2020-05-20 15:56 +0200
URL:       https://hg.openjdk.java.net/jdk/sandbox/rev/0c21a8e4fe47

8244733: Add ResourceHashtable::xxx_if_absent
Reviewed-by: coleenp, iklam, rehn, dholmes

! src/hotspot/share/classfile/bytecodeAssembler.cpp
! src/hotspot/share/classfile/classLoaderStats.cpp
! src/hotspot/share/classfile/classLoaderStats.hpp
! src/hotspot/share/classfile/systemDictionaryShared.cpp
! src/hotspot/share/jfr/periodic/jfrPeriodic.cpp
! src/hotspot/share/utilities/resourceHash.hpp
! test/hotspot/gtest/utilities/test_resourceHash.cpp