RFR: 8365501: Remove speical AdapterHandlerEntry for abstract methods [v2]

[Ashutosh Mehra]

> This PR removes the need for having AdapterHandlerEntry for abstract methods. The check for abstract method is now done in the accessor functions in Method such as Method::get_i2c_entry().
> Motivation for this change is described in the JBS issue.

Ashutosh Mehra has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains two additional commits since the last revision:

 - Merge branch 'master' into remove-abstract_method_handler
 - 8365501: Remove speical AdapterHandlerEntry for abstract methods
   
   Signed-off-by: Ashutosh Mehra <asmehra at redhat.com>

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Changes:
  - all: https://git.openjdk.org/jdk/pull/26764/files
  - new: https://git.openjdk.org/jdk/pull/26764/files/b0cf055a..cd8b85f4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=26764&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=26764&range=00-01

  Stats: 27063 lines in 851 files changed: 15250 ins; 8209 del; 3604 mod
  Patch: https://git.openjdk.org/jdk/pull/26764.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/26764/head:pull/26764

PR: https://git.openjdk.org/jdk/pull/26764