RFR: 8264972: Unused TypeFunc declared in OptoRuntime

[Yi Yang]

When investigating some C2 related stuff, I noticed that some TypeFunc are declared in OptoRuntime since JDK6:

  // leaf on stack replacement interpreter accessor types
  static const TypeFunc* fetch_int_Type();
  static const TypeFunc* fetch_long_Type();
  static const TypeFunc* fetch_float_Type();
  static const TypeFunc* fetch_double_Type();
  static const TypeFunc* fetch_oop_Type();
  static const TypeFunc* fetch_monitor_Type();

They are not used nor implemented. It looks like we can remove them(I'm curious about their stories/history.)

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Commit messages:
 - remove unused TypeFunc

Changes: https://git.openjdk.java.net/jdk/pull/3429/files
 Webrev: https://webrevs.openjdk.java.net/?repo=jdk&pr=3429&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8264972
  Stats: 8 lines in 1 file changed: 0 ins; 8 del; 0 mod
  Patch: https://git.openjdk.java.net/jdk/pull/3429.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/3429/head:pull/3429

PR: https://git.openjdk.java.net/jdk/pull/3429