RFR: 8253842: [JVMCI] Allow implicit exception to dispatch to other address in jvmci compilers. [v2]

[Yudi Zheng]

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

Yudi Zheng has updated the pull request incrementally with one additional commit since the last revision:

  Address comments.

-------------

Changes:
  - all: https://git.openjdk.java.net/jdk/pull/472/files
  - new: https://git.openjdk.java.net/jdk/pull/472/files/ea3c39e3..fe63251d

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=472&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=472&range=00-01

  Stats: 5 lines in 1 file changed: 0 ins; 0 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/472.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/472/head:pull/472

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