RFR: WIP Weird gson

[Jiří Vaněk]

see original story https://github.com/openjdk/asmtools/pull/28
This is placeholdr for:
 - verify the fix (https://github.com/openjdk/asmtools/commit/64b6c474bd2c1faa02a0cbe43f64bfc5bf18efa9)
 - include testing machinery to work upon binary resources

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Commit messages:
 - DO NOT MERGE - broken gson class
 - added tests if asmtools assmble itself into valid bytecode

Changes: https://git.openjdk.org/asmtools/pull/43/files
 Webrev: https://webrevs.openjdk.org/?repo=asmtools&pr=43&range=00
  Stats: 447 lines in 8 files changed: 447 ins; 0 del; 0 mod
  Patch: https://git.openjdk.org/asmtools/pull/43.diff
  Fetch: git fetch https://git.openjdk.org/asmtools pull/43/head:pull/43

PR: https://git.openjdk.org/asmtools/pull/43