RFR: 8258032: Reconsider LEAF entry restrictions

[Coleen Phillimore]

On Fri, 18 Dec 2020 19:38:09 GMT, Coleen Phillimore <coleenp at openjdk.org> wrote:

> This change allows JRT_LEAF functions to create Handles because it doesn't need them but some code inside the VM needs Handles.  There's a NoSafepointVerifier in JRT_LEAF functions.
> The JNI_LEAF and JVM_LEAF functions have NoHandleMark (so you can't create handles) but the transition ThreadInVMfromNative will reenable the HandleMarks, so that all this code doesn't have to do it itself.
> Tested with tier1-6.

Ron, thanks for looking at this and for this request.

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PR: https://git.openjdk.java.net/jdk/pull/1846