[jdk21] RFR: 8313241: Temporarily disable "malformed control flow" assert to reduce noise [v2]

[Tobias Hartmann]

> [JDK-8303951](https://bugs.openjdk.org/browse/JDK-8303951) added asserts before several C2 compilation bailouts that we were never able to trigger in our testing. The "malformed control flow" assert now triggers regularly (see [JDK-8308392](https://bugs.openjdk.org/browse/JDK-8308392) and [JDK-8312980](https://bugs.openjdk.org/browse/JDK-8312980)). Let's disable it in JDK 21 to reduce the noise in the CI.
> 
> I also reverted the problem listing done by [JDK-8313208](https://bugs.openjdk.org/browse/JDK-8313208) because, as @AlanBateman noted in https://github.com/openjdk/jdk21/pull/145, it's too invasive.
> 
> Approval is pending.
> 
> Thanks,
> Tobias

Tobias Hartmann has updated the pull request incrementally with one additional commit since the last revision:

  removed debug printing

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

Changes:
  - all: https://git.openjdk.org/jdk21/pull/146/files
  - new: https://git.openjdk.org/jdk21/pull/146/files/3377f7c0..706c276d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk21&pr=146&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk21&pr=146&range=00-01

  Stats: 1 line in 1 file changed: 0 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk21/pull/146.diff
  Fetch: git fetch https://git.openjdk.org/jdk21.git pull/146/head:pull/146

PR: https://git.openjdk.org/jdk21/pull/146