Update the code gen code in CallGeneratorHelper to reflect the latest state of the libTest(Downcall/Upcall)(Stack).c and shared.h files.
- The previous code wanted users to pipe stdout into a file. But, since we have 5 files that need to be created, and the names of those files is important too, I've changed the script to write to those files directly instead. - I moved the definition of `S_FFFF` to libVarArgs.c where it's used, as it's not actually generated by CallGeneratorHelper. - GitHub doesn't render the changes to some of the files, but those files only contain either white space changes (some missing spaces after `,`), and copyright header updates. ------------- Commit messages: - add more run instructions - simplify - use export.h - factor out some shared code - fix test file generation - remove dead code from CallGeneratorHelper Changes: https://git.openjdk.org/jdk/pull/18269/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=18269&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8327994 Stats: 36078 lines in 6 files changed: 62 ins; 40 del; 35976 mod Patch: https://git.openjdk.org/jdk/pull/18269.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/18269/head:pull/18269 PR: https://git.openjdk.org/jdk/pull/18269
