[jdk18] RFR: 8275638: GraphKit::combine_exception_states fails with "matching stack sizes" assert

[Vladimir Kozlov]

On Wed, 15 Dec 2021 10:24:59 GMT, Roland Westrelin <roland at openjdk.org> wrote:

> The bug and fix were discussed in a previous PR:
> 
> https://github.com/openjdk/jdk/pull/6572
> 
> I pushed all commits from that PR on top of jdk 18 and added a couple
> extra tests as suggested in:
> 
> https://github.com/openjdk/jdk/pull/6572#issuecomment-994086590

I agree with this conservative fix. John agreed with it too.
@dean-long please run testing for it before Roland pushed it. Also file RFE to clean these up - we will assign an engineer to look on it later.

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Marked as reviewed by kvn (Reviewer).

PR: https://git.openjdk.java.net/jdk18/pull/29