RFR: 8293011: riscv: Duplicated stubs to interpreter for static calls [v3]

[Dingli Zhang]

> Follow up [JDK-8280481](https://bugs.openjdk.org/browse/JDK-8280481).
> Calls of Java methods have stubs to the interpreter for the cases when an invoked Java method is not compiled. Calls of static Java methods and final Java methods have statically bound information about a callee during compilation. C1 and C2 always generate a new stub for each call. As the generated stubs for calls of the same method are the same, they can be shared.
> 
> ## Testing:
> 
> - hotspot/jdk tier1 on unmatched board
> - hotspot/jtreg/compiler/sharedstubs/SharedStubToInterpTest.java on qemu
> 
> 
> ## Results
> #### Results from [Renaissance 0.14.0](https://github.com/renaissance-benchmarks/renaissance/releases/tag/v0.14.0)
> Note: 'Nmethods with shared stubs' is the total number of nmethods counted during benchmark's run. 'Final # of nmethods' is a number of nmethods in CodeCache when JVM exited.
> 
> - riscv64
> 
> +------------------+-------------+----------------------------+---------------------+
> | Benchmark        | Saved bytes | Nmethods with shared stubs | Final # of nmethods |
> +------------------+-------------+----------------------------+---------------------+
> | dotty            |     1099488 |                       4483 |               12447 |
> | dec-tree         |      511296 |                       2310 |               18583 |
> | naive-bayes      |      358128 |                       1714 |                8677 |
> | log-regression   |      365136 |                       1662 |               14626 |
> | als              |      444576 |                       2107 |                8464 |
> | finagle-chirper  |      265584 |                       1558 |               11003 |
> | movie-lens       |      397776 |                       2106 |                6842 |
> | finagle-http     |      160656 |                        974 |                7243 |
> | page-rank        |      246672 |                       1261 |               10293 |
> | chi-square       |      196080 |                        992 |                8841 |
> | akka-uct         |      138672 |                        595 |                4564 |
> | reactors         |       57552 |                        328 |                2338 |
> | scala-stm-bench7 |       42122 |                        254 |                2261 |
> | philosophers     |       45744 |                        241 |                1945 |
> | scala-doku       |       48624 |                        213 |                 794 |
> | rx-scrabble      |       46128 |                        271 |                1945 |
> | future-genetic   |       37248 |                        234 |                1818 |
> | scrabble         |       30384 |                        170 |                1628 |
> | par-mnemonics    |       28176 |                        137 |                1317 |
> +------------------+-------------+----------------------------+---------------------+

Dingli Zhang 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 two additional commits since the last revision:

 - Add missing copyright
 - Port JDK-8280481 to RISC-V

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/10057/files
  - new: https://git.openjdk.org/jdk/pull/10057/files/b5000dcf..11a447a4

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=10057&range=02
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=10057&range=01-02

  Stats: 1487 lines in 65 files changed: 919 ins; 158 del; 410 mod
  Patch: https://git.openjdk.org/jdk/pull/10057.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/10057/head:pull/10057

PR: https://git.openjdk.org/jdk/pull/10057