RFR: 7903912: JMH: Pad using a mix of bytes and longs [v2]

[Claes Redestad]

> Using a mix of bytes and longs we should get the gap-filling effect described in https://shipilev.net/jvm/objects-inside-out/#_observation_hierarchy_tower_padding_trick_collapse_in_jdk_15 while reducing size of generated code by roughly 20%:
> 
> 
> 864772  jmh-samples/target/jmh-samples-1.38-SNAPSHOT.jar
> 490531  jmh-samples/target/jmh-samples-1.38-SNAPSHOT-sources.jar
> 
> 684383 jmh-samples/target/jmh-samples-1.38-SNAPSHOT.jar
> 399758 jmh-samples/target/jmh-samples-1.38-SNAPSHOT-sources.jar

Claes Redestad has updated the pull request with a new target base due to a merge or a rebase. The incremental webrev excludes the unrelated changes brought in by the merge/rebase. The pull request contains four additional commits since the last revision:

 - Merge branch 'master' into byte_long_padding
 - Adjust hierarchical padding in static code
 - Superficial comment change to trigger pre-integration tests
 - Pad with a mix of bytes and longs

-------------

Changes:
  - all: https://git.openjdk.org/jmh/pull/147/files
  - new: https://git.openjdk.org/jmh/pull/147/files/a38de587..c6472b48

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jmh&pr=147&range=01
 - incr: https://webrevs.openjdk.org/?repo=jmh&pr=147&range=00-01

  Stats: 214 lines in 21 files changed: 134 ins; 25 del; 55 mod
  Patch: https://git.openjdk.org/jmh/pull/147.diff
  Fetch: git fetch https://git.openjdk.org/jmh.git pull/147/head:pull/147

PR: https://git.openjdk.org/jmh/pull/147