RFR: 8253842: [JVMCI] Allow implicit exception to dispatch to other address in jvmci compilers.

[Doug Simon]

On Thu, 1 Oct 2020 18:35:04 GMT, Yudi Zheng <yzheng at openjdk.org> wrote:

> This change allows JVMCI compilers to append an entry with flexible dispatch offset to the implicit exception table.

src/jdk.internal.vm.ci/share/classes/jdk.vm.ci.code/src/jdk/vm/ci/code/site/ImplicitExceptionDispatch.java line 31:

> 29: /**
> 30:  * Represents an implicit exception dispatch in the code. Implicit exception is a platform-specific
> 31:  * optimization that makes use of operating system's trap mechanism, to turn specific branches into

Implicit exception _dispatch_ is a ...

... _an_ operating system

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PR: https://git.openjdk.java.net/jdk/pull/472