[jdk16] RFR: 8257910: [JVMCI] Set exception_seen accordingly in the runtime.

[Yudi Zheng]

Update exception_seen flag in the MDO when no exception handler is found for caller during deoptimization, or when exception is thrown in the runtime.

Plus, -Xlog:exceptions=info code and AbortVMOnException are adjusted in C1 runtime and jvmci runtime to be consistent with C2, i.e., before JvmtiExport::can_post_on_exceptions deoptimization and fast continuation when compiled handler is found.

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Commit messages:
 - Set exception_seen accordingly in the runtime.
 - Adjust log:exceptions dumping code in C1 and JVMCI runtimes.

Changes: https://git.openjdk.java.net/jdk16/pull/2/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk16&pr=2&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8257910
  Stats: 90 lines in 4 files changed: 62 ins; 28 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk16/pull/2.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk16 pull/2/head:pull/2

PR: https://git.openjdk.java.net/jdk16/pull/2