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

[Fei Yang]

On Mon, 27 Mar 2023 04:16:19 GMT, Xiaolin Zheng <xlinzheng at openjdk.org> wrote:

> 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.

Looks good.

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Marked as reviewed by fyang (Committer).

PR Review: https://git.openjdk.org/riscv-port-jdk17u/pull/28#pullrequestreview-1358851843