RFR: 8299726: [cleanup] Some code cleanup in opto/compile.hpp

[xpbob]

Hi all,
Int_Array,Scope,TypeData,debug_option_name  is unused
Remove them
Thanks.

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Commit messages:
 - 8299726: [cleanup] Some code cleanup in opto/compile.hpp

Changes: https://git.openjdk.org/jdk/pull/11879/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=11879&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8299726
  Stats: 4 lines in 1 file changed: 0 ins; 4 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/11879.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11879/head:pull/11879

PR: https://git.openjdk.org/jdk/pull/11879