RFR: 8249451: Unconditional exceptions clearing logic in compiler code should honor Async Exceptions. [v4]

[Jamsheed Mohammed C M]

> Hi
> 
> Moving the review that is based on mercurial repo to github.
> The history of conversation is
> [here](https://mail.openjdk.java.net/pipermail/hotspot-compiler-dev/2020-September/039861.html)
> Issue:[ JDK-8249451 ](https://bugs.openjdk.java.net/browse/JDK-8249451)
> 
> @dholmes-ora could you please have a look.

Jamsheed Mohammed C M has refreshed the contents of this pull request, and previous commits have been removed. The
incremental views will show differences compared to the previous content of the PR. The pull request contains one new
commit since the last revision:

  comment modified wrt review feedback

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Changes:
  - all: https://git.openjdk.java.net/jdk/pull/169/files
  - new: https://git.openjdk.java.net/jdk/pull/169/files/506094bf..9777e8c4

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=169&range=03
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=169&range=02-03

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jdk/pull/169.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/169/head:pull/169

PR: https://git.openjdk.java.net/jdk/pull/169