RFR: 8205129: Remove java.lang.Compiler

[Eirik Bjorsnos]

Please help review this PR which suggests we remove the class `java.lang.Compiler`. The class seems non-functional for a decade, and was terminally deprecated in Java 9. Time has come to let it go.

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Commit messages:
 - Remove the deprecated class java.lang.Compiler

Changes: https://git.openjdk.org/jdk/pull/13092/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=13092&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8205129
  Stats: 105 lines in 1 file changed: 0 ins; 105 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/13092.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/13092/head:pull/13092

PR: https://git.openjdk.org/jdk/pull/13092