git: openjdk/jdk21: 8307508: IndirectVarHandle.isAccessModeSupported throws NPE

[Mandy Chung]

Changeset: 6711041f
Author:    Chen Liang <liach at openjdk.org>
Committer: Mandy Chung <mchung at openjdk.org>
Date:      2023-06-14 00:01:24 +0000
URL:       https://git.openjdk.org/jdk21/commit/6711041f55a52e3198f63c53cc165efbb5a27588

8307508: IndirectVarHandle.isAccessModeSupported throws NPE

Reviewed-by: mchung
Backport-of: 75dcc4ef94d90e4aa7f8ca5eccc97c91492d6eed

! src/java.base/share/classes/java/lang/invoke/IndirectVarHandle.java
! src/java.base/share/classes/java/lang/invoke/VarHandle.java
+ test/jdk/java/lang/invoke/VarHandles/IndirectVarHandleTest.java