RFR: 8255890: Zero: remove unused methods from BytecodeInterpreter

[Aleksey Shipilev]

There are lots of local/stack management methods that are not used at all. Macro-definitions are used instead. Can clean them up to avoid further bitrot.

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Commit messages:
 - 8255890: Zero: remove unused methods from BytecodeInterpreter

Changes: https://git.openjdk.java.net/jdk/pull/1060/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=1060&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8255890
  Stats: 186 lines in 2 files changed: 1 ins; 185 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/1060.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/1060/head:pull/1060

PR: https://git.openjdk.java.net/jdk/pull/1060