RFR: JDK-8311076: RedefineClasses doesn't check for ConstantPool overflow

[Chris Plummer]

On Wed, 7 Feb 2024 20:53:53 GMT, Alex Menkov <amenkov at openjdk.org> wrote:

> The fix adds check that merged constant pool does not overflow u2 (two-byte unsigned).
> The check is added after merging `the_class` and `scratch_class` constant pools, but before rewriting constant pool references.
> 
> testing:
>  - sanity tier1;
>  - all RedefineClasses/RetransformClasses tests:
>    - test/jdk/java/lang/instrument
>    - test/hotspot/jtreg/serviceability/jvmti/RedefineClasses
>    - test/hotspot/jtreg/vmTestbase/nsk/jvmti/RedefineClasses
>    - test/hotspot/jtreg/vmTestbase/nsk/jvmti/RetransformClasses

It looks like we don't have a reproducer for this issue. Please add the appropriate noreg label.

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PR Review: https://git.openjdk.org/jdk/pull/17759#pullrequestreview-1871610809