RFR: 8331030: langtools/tools/javac/tree tests fail with SOE with fastdebug and -Xcomp

[Christian Stein]

Please review this change that now uses a source generator and compiler task to verify no SOE is thrown.

This change replaces over 1000 lines of code that were being compiled by running this test as well as other tests crawling over test files. Some of those crawling tests failed to parse this formerly large file. The new size of this test file should be no problem for them.

The level of nesting is increased from 567 to 1000.

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Commit messages:
 - 8331030: langtools/tools/javac/tree tests fail with SOE with fastdebug and -Xcomp

Changes: https://git.openjdk.org/jdk/pull/18939/files
  Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18939&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8331030
  Stats: 1159 lines in 1 file changed: 5 ins; 1133 del; 21 mod
  Patch: https://git.openjdk.org/jdk/pull/18939.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/18939/head:pull/18939

PR: https://git.openjdk.org/jdk/pull/18939