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

[Yudi Zheng]

On Thu, 10 Dec 2020 18:17:14 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

>> 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.
>
> Good.

@vnkozlov I am not a committer, would you please sponsor this change?

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