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

[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.

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Commit messages:
 - webrev.03

Changes: https://git.openjdk.java.net/jdk/pull/169/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=169&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8249451
  Stats: 217 lines in 20 files changed: 104 ins; 38 del; 75 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