RFR: 8331421: ubsan: vmreg.cpp checking error member call on misaligned address

[Martin Doerr]

On Tue, 30 Apr 2024 13:56:07 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

> As shown in the JBS issue, the Undefined Behavior Sanitizer complains about `VMRegImpl::stack_0()->value()`. This can easily be avoided by skipping the more complicated way which includes addition and subtraction of `first()`.

Thanks for the reviews!

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PR Comment: https://git.openjdk.org/jdk/pull/19022#issuecomment-2090106095