RFR: 8253740: [PPC64] Minor interpreter cleanup

[Martin Doerr]

Template interpreter on PPC64 can be cleaned up after JDK-8253540:
unlock_object has a parameter check_for_exceptions which is now unused.

In addition to that, restore_interpreter_state is redundant after
call_VM(R4_ARG2, CAST_FROM_FN_PTR(address, InterpreterRuntime::member_name_arg_or_null) because it's already included
in call_VM.

https://bugs.openjdk.java.net/browse/JDK-8253740

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Commit messages:
 - 8253740: [PPC64] Minor interpreter cleanup

Changes: https://git.openjdk.java.net/jdk/pull/385/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=385&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8253740
  Stats: 9 lines in 3 files changed: 0 ins; 4 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/385.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/385/head:pull/385

PR: https://git.openjdk.java.net/jdk/pull/385