RFR: 8264732: Clean up LinkResolver::vtable_index_of_interface_method()

[Vladimir Ivanov]

Turn `resolved_method` parameter into raw `Method*`.

Testing:
* [x] hs-tier1 - hs-tier6

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Commit messages:
 - LinkResolver::vtable_index_of_interface_method

Changes: https://git.openjdk.java.net/jdk/pull/3346/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3346&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8264732
  Stats: 7 lines in 3 files changed: 0 ins; 2 del; 5 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3346.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3346/head:pull/3346

PR: https://git.openjdk.java.net/jdk/pull/3346