[lworld] RFR: 8254957: Comparison of ArrayList with int, Integer, PrimitiveInt, ...

[Roger Riggs]

Prototypes and JMH benchmarks to compare possible implementations of ArrayListInt, ArrayListPrimitiveInt with
ArrayList<Integer> and ArrayList<PrimitiveInt>.

Located in .../test/micro/org/openjdk/bench/valhalla/sandbox/corelibs/...

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Commit messages:
 - Merge branch 'lworld' into ArrayListOfInt
 - adding benchmarks
 - Benchmark cleanup and improvements
 - Start of comparison of List<int>, List<Integer>, List<PrimitiveInt>

Changes: https://git.openjdk.java.net/valhalla/pull/229/files
 Webrev: https://webrevs.openjdk.java.net/?repo=valhalla&pr=229&range=00
  Issue: https://bugs.openjdk.java.net/browse/JDK-8254957
  Stats: 1628 lines in 19 files changed: 1587 ins; 41 del; 0 mod
  Patch: https://git.openjdk.java.net/valhalla/pull/229.diff
  Fetch: git fetch https://git.openjdk.java.net/valhalla pull/229/head:pull/229

PR: https://git.openjdk.java.net/valhalla/pull/229