RFR: 8336256: memcpy short value to int local is incorrect in VtableStubs::unsafe_hash

[Aleksey Shipilev]

On Thu, 11 Jul 2024 14:18:07 GMT, Richard Reingruber <rrich at openjdk.org> wrote:

> Make sure the local variable used as target of the `memcpy` in `VtableStubs::unsafe_hash` has the same size as `VtableStub::_index` which is the source of the `memcpy`.
> 
> With this fix we don't see the crashes reported in the JBS-issue.
> 
> JTReg tests: tier1-4 of hotspot and jdk. All of Langtools and jaxp. Renaissance Suite and SAP specific tests.
> Testing was done with fastdebug and release builds on the main platforms and also on Linux/PPC64le and AIX.

Marked as reviewed by shade (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/20137#pullrequestreview-2174136056