RFR: 8266819: Separate the stop policies from the compile policies completely

[Guoxiong Li]

Hi all,

This patch removes the compile policies `ATTR_ONLY` and `CHECK_ONLY` so that the compile policies can be separated from the stop policies. And some corresponding tests need to be adjusted, too.

Please see [JDK-8266819](https://bugs.openjdk.java.net/browse/JDK-8266819) and the [original discussion](https://mail.openjdk.java.net/pipermail/compiler-dev/2021-May/016759.html) for more information.

Thank you for taking the time to review.

Best Regards,
-- Guoxiong

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Commit messages:
 - 8266819: Separate the stop policies from the compile policies completely

Changes: https://git.openjdk.java.net/jdk/pull/3961/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3961&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8266819
  Stats: 48 lines in 9 files changed: 3 ins; 27 del; 18 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3961.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3961/head:pull/3961

PR: https://git.openjdk.java.net/jdk/pull/3961