RFR: 8278583: Open source SwingMark - Swing performance benchmark [v2]

[Phil Race]

> This is the SwingMark performance benchmark.
> It is very simplistic by today's standards but has been in use since 1998
> and gives a sense of changes that affect the UI stack not just core Java 2D
> tight loop rendering.
> It is mostly "as is" with these exceptions
> 
> 1) I did some tidying up of the woeful code formatting
> 2) I migrated some deprecated API and suppressed warnings for others (some future work there, but I didn't want to make changes that might affect comparisons)
> 3) I added a Makefile and support for building as a jar.
> 4) TestList.txt is a resource in the .jar so most folks don't need to worry about it
> 5) README is cleaned up and updated
> 6) I used the same licensing as J2DBench
> 7) I've put it alongside RenderPerfTest in the sources

Phil Race has updated the pull request incrementally with one additional commit since the last revision:

  8278583

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Changes:
  - all: https://git.openjdk.org/jdk/pull/13486/files
  - new: https://git.openjdk.org/jdk/pull/13486/files/1841c85e..ebc0ce6d

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=13486&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=13486&range=00-01

  Stats: 23 lines in 11 files changed: 0 ins; 0 del; 23 mod
  Patch: https://git.openjdk.org/jdk/pull/13486.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/13486/head:pull/13486

PR: https://git.openjdk.org/jdk/pull/13486