RFR: 8332327: Return _methods_jmethod_ids field back in VMStructs

[Aleksey Shipilev]

On Wed, 15 May 2024 21:12:03 GMT, Andrei Pangin <apangin at openjdk.org> wrote:

> The fix for [JDK-8313332](https://bugs.openjdk.org/browse/JDK-8313332) has [removed](https://github.com/openjdk/jdk/commit/21867c929a2f2c961148f2cd1e79d672ac278d27#diff-7d448441e80a0b784429d5d8aee343fcb131c224b8ec7bc70ea636f78d561ecd
> ) `InstanceKlass::_methods_jmethod_ids` field from VMStructs.
> 
> This broke [async-profiler](https://github.com/async-profiler/async-profiler/), since the profiler needs this field to obtain jmethodID in some corner cases.
> 
> There was no actual need for removal, as the field is still there in InstanceKlass. So, I propose to return the field back to restore the broken functionality of async-profiler. This is a no risk change, because it only exports an offset of one field and does not affect the JVM otherwise.

Marked as reviewed by shade (Reviewer).

-------------

PR Review: https://git.openjdk.org/jdk/pull/19254#pullrequestreview-2061331053