RFR: 8308992: New test TestHFA fails with zero

[Maurizio Cimadamore]

On Tue, 30 May 2023 12:17:00 GMT, Jorn Vernee <jvernee at openjdk.org> wrote:

> The issue is that the fallback linker uses `copyFrom` when copying a by-value struct argument to an internal buffer, without first adjusting the size of the argument segment. This means that if the argument segment is 'too large' (i.e. larger than the layout it was linked with) we fail with an exception since the internal buffer is too small for the entire argument segment to be copied into.
> 
> The fix is simply to use an exactly-sized copy instead, just like we do in other linker implementations. (The argument segment being too large is fine, all we care about is that it's large enough).
> 
> Testing: jdk-tier5

Marked as reviewed by mcimadamore (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/14215#pullrequestreview-1451127172