[riscv-port-jdk11u:riscv-port] RFR: 8328065: RISC-V: Add isolation for shared code changes

[Andreas Schwab]

On Wed, 13 Mar 2024 14:08:22 GMT, Gui Cao <gcao at openjdk.org> wrote:

> Hi, We want to add isolation for shared code changes. 
> 1. To minimize the difference with jdk17u-dev upstream, the jdk17u-dev backport does isolate public code changes to avoid code changes to other architectures [1] 
> 2. riscv-port-jdk11u is missing the sparc architecture adaptation in the backport, this may affect the correctness of the sparc architecture.
> ### Test
> - [x] Run tier1-3 tests on linux-x86 (release)
> - [x] Run tier1-3 tests on linux-arm64 (release)
> - [x] Run tier1-3 tests on on LicheePI 4A (release)
> 
> [1] https://github.com/yadongw/riscv-port-jdk17u/commit/6bc31f690036ebf7d0db55b1e2ef83b13b74fed3

There are a few leftover changes:

- make/autoconf/libraries.m4 is no longer modified due to 8316645, but
  still has the copyright date change.

- spurious space change in src/hotspot/cpu/ppc/c1_LIRAssembler_ppc.cpp

- another copyright date change in unmodified src/hotspot/share/opto/regmask.hpp

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PR Comment: https://git.openjdk.org/riscv-port-jdk11u/pull/11#issuecomment-2008910914