RFR: 8309889: [s390] Missing return statement after calling jump_to_native_invoker mrthod in generate_method_handle_dispatch.

[sid8606]

Missing return statement after calling jump_to_native_invoker mrthod in generate_method_handle_dispatch, it leads to assert(is_valid()) failed: invalid register.

Ran tier1 test cases passing with release, fastdebug and slowdebug.

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

Commit messages:
 - 8309889: Missing return statement after calling jump_to_native_invoker mrthod in generate_method_handle_dispatch

Changes: https://git.openjdk.org/jdk/pull/14647/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=14647&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8309889
  Stats: 1 line in 1 file changed: 1 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/14647.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/14647/head:pull/14647

PR: https://git.openjdk.org/jdk/pull/14647