RFR: 8332587: RISC-V: secondary_super_cache does not scale well [v7]

[Gui Cao]

> Implementation of subtype checking [JDK-8180450](https://bugs.openjdk.org/browse/JDK-8180450) for linux-riscv64.
> This optimization depends on availability of the Zbb extension which has the cpop instruction.
> 
> ### Correctness testing:
> 
> - [x]  Run tier1-3, hotspot:tier4 tests on SOPHON SG2042 (release)
> - [x] Run tier1-3 tests with -XX:+UseRVV on qemu 8.1.0 (fastdebug)
> - [x] Run all of tier1 with `-XX:+VerifySecondarySupers`
> 
> ### JMH tested on Banana Pi BPI-F3 board (has Zbb) and Enable UseZbb, Not Enable UseZba, UseZbs
> Original:
> 
> Benchmark                             Mode  Cnt    Score   Error  Units
> SecondarySuperCacheHits.test  avgt   15  11.375 ± 0.071  ns/op
> SecondarySuperCacheInterContention.test     avgt   15  646.087 ± 32.587  ns/op
> SecondarySuperCacheInterContention.test:t1  avgt   15  600.090 ± 83.779  ns/op
> SecondarySuperCacheInterContention.test:t2  avgt   15  692.084 ± 73.218  ns/op
> SecondarySupersLookup.testNegative00  avgt   15   16.420 ± 0.239  ns/op
> SecondarySupersLookup.testNegative01  avgt   15   18.307 ± 0.260  ns/op
> SecondarySupersLookup.testNegative02  avgt   15   21.695 ± 0.458  ns/op
> SecondarySupersLookup.testNegative03  avgt   15   24.855 ± 0.664  ns/op
> SecondarySupersLookup.testNegative04  avgt   15   27.305 ± 0.522  ns/op
> SecondarySupersLookup.testNegative05  avgt   15   29.719 ± 0.385  ns/op
> SecondarySupersLookup.testNegative06  avgt   15   32.231 ± 0.498  ns/op
> SecondarySupersLookup.testNegative07  avgt   15   33.747 ± 0.603  ns/op
> SecondarySupersLookup.testNegative08  avgt   15   35.856 ± 0.629  ns/op
> SecondarySupersLookup.testNegative09  avgt   15   37.077 ± 0.546  ns/op
> SecondarySupersLookup.testNegative10  avgt   15   39.408 ± 0.465  ns/op
> SecondarySupersLookup.testNegative16  avgt   15   51.041 ± 0.547  ns/op
> SecondarySupersLookup.testNegative20  avgt   15   58.722 ± 0.922  ns/op
> SecondarySupersLookup.testNegative30  avgt   15   77.310 ± 0.654  ns/op
> SecondarySupersLookup.testNegative32  avgt   15   81.116 ± 0.854  ns/op
> SecondarySupersLookup.testNegative40  avgt   15   96.311 ± 0.840  ns/op
> SecondarySupersLookup.testNegative50  avgt   15  115.427 ± 0.838  ns/op
> SecondarySupersLookup.testNegative55  avgt   15  124.371 ± 1.076  ns/op
> SecondarySupersLookup.testNegative56  avgt   15  126.796 ± 0.916  ns/op
> SecondarySupersLookup.testNegative57  avgt   15  127.952 ± 1.202  ns/op
> SecondarySupersLookup.testNegative58  avgt   15  131.956 ± 4.515  ns/op
> SecondarySupersLookup.testNegative59  avgt   15  131.858 ± 1.066  ns/op
> SecondaryS...

Gui Cao has updated the pull request incrementally with one additional commit since the last revision:

  Put  "secondary super table" generate code inside COMPILER2 macro

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/19320/files
  - new: https://git.openjdk.org/jdk/pull/19320/files/142d7677..ec01d64b

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=19320&range=06
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=19320&range=05-06

  Stats: 2 lines in 1 file changed: 1 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/jdk/pull/19320.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/19320/head:pull/19320

PR: https://git.openjdk.org/jdk/pull/19320