[jdk17u-dev] RFR: 8288303: C1: Miscompilation due to broken Class.getModifiers intrinsic

[Aleksey Shipilev]

Clean backport to fix the C1 intrinsic.

Additional testing:
 - [x] Linux x86_32 fastdebug, JFR reproducer does not hang anymore
 - [x] Linux x86_32 fastdebug, new test passes
 - [x] Linux x86_64 fastdebug, new test passes
 - [ ] Linux x86_32 fastdebug, tier1 passes
 - [ ]  Linux x86_64 fastdebug, tier1 passes

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Commit messages:
 - Backport 8cd87e731bcaff2d7838995c68056742d577ad3b

Changes: https://git.openjdk.org/jdk17u-dev/pull/500/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk17u-dev&pr=500&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8288303
  Stats: 141 lines in 2 files changed: 130 ins; 5 del; 6 mod
  Patch: https://git.openjdk.org/jdk17u-dev/pull/500.diff
  Fetch: git fetch https://git.openjdk.org/jdk17u-dev pull/500/head:pull/500

PR: https://git.openjdk.org/jdk17u-dev/pull/500