[riscv-port-jdk11u:riscv-port] RFR: 8294366: RISC-V: Partially mark out incompressible regions [v2]

[Dingli Zhang]

> Hi,
> Please help review this backport to riscv-port-jdk11u.
> 
> Backport of [JDK-8294366](https://bugs.openjdk.org/browse/JDK-8294366).
> 
> The original patch cannot be directly applied because of riscv-port-jdk11u do not have `BarrierSetAssembler::nmethod_entry_barrier`, [JDK-8223173](https://bugs.openjdk.org/browse/JDK-8223173) or [JDK-8223173](https://bugs.openjdk.org/browse/JDK-8293007).
> 
> Testing:
> - Tier1 passed without new failure on lp4a (release).

Dingli Zhang has updated the pull request incrementally with one additional commit since the last revision:

  fix build_frame

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

Changes:
  - all: https://git.openjdk.org/riscv-port-jdk11u/pull/43/files
  - new: https://git.openjdk.org/riscv-port-jdk11u/pull/43/files/a8545465..aa06797e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=riscv-port-jdk11u&pr=43&range=01
 - incr: https://webrevs.openjdk.org/?repo=riscv-port-jdk11u&pr=43&range=00-01

  Stats: 2 lines in 1 file changed: 1 ins; 1 del; 0 mod
  Patch: https://git.openjdk.org/riscv-port-jdk11u/pull/43.diff
  Fetch: git fetch https://git.openjdk.org/riscv-port-jdk11u.git pull/43/head:pull/43

PR: https://git.openjdk.org/riscv-port-jdk11u/pull/43