[riscv-port-jdk17u:riscv-port] RFR: 8294366: RISC-V: Partially mark out incompressible regions [v2]

[Xiaolin Zheng]

> One little difference: there is no `C2_MacroAssembler::emit_entry_barrier_stub` on JDK17.
> 
> Tested along with remaining patches, hotspot tier1~4 with fastdebug build.

Xiaolin Zheng has updated the pull request incrementally with one additional commit since the last revision:

  8305112: RISC-V: Typo fix for RVC description
  
  Reviewed-by: dholmes

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

Changes:
  - all: https://git.openjdk.org/riscv-port-jdk17u/pull/28/files
  - new: https://git.openjdk.org/riscv-port-jdk17u/pull/28/files/90f0054f..b3f970ad

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=riscv-port-jdk17u&pr=28&range=01
 - incr: https://webrevs.openjdk.org/?repo=riscv-port-jdk17u&pr=28&range=00-01

  Stats: 2 lines in 1 file changed: 0 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/riscv-port-jdk17u/pull/28.diff
  Fetch: git fetch https://git.openjdk.org/riscv-port-jdk17u.git pull/28/head:pull/28

PR: https://git.openjdk.org/riscv-port-jdk17u/pull/28