RFR: 8317818: Combinatorial explosion during 'this' escape analysis [v2]

[Archie Cobbs]

> The `this-escape` analysis stops infinite recursions during the analysis by keeping track of what methods have already been invoked with any given set of current references.
> 
> However, it was using the method call site, not the target method itself, for this tracking. This can lead to a combinatorial explosion, for example, if there are multiple recursive calls inside the target method, where we would end up recursing through all possible combinations of call sites before stopping the recursion.
> 
> The fix is to key on the target method itself, not on whatever call site.

Archie Cobbs has updated the pull request with a new target base due to a merge or a rebase. The pull request now contains two commits:

 - Merge remote-tracking branch 'upstream/master' into JDK-8317818
 - Track 'this-escape' recursion by target method, not by call site.

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Changes: https://git.openjdk.org/jdk/pull/16125/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16125&range=01
  Stats: 32 lines in 2 files changed: 30 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/16125.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16125/head:pull/16125

PR: https://git.openjdk.org/jdk/pull/16125