8295110: RISC-V: Mark out relocations as incompressible

[DingliZhang]

Hi,
Please help review this backport to riscv-port-jdk11u.
This backport contains multiple issues:

• 8295110: RISC-V: Mark out relocations as incompressible
• 8305112: RISC-V: Typo fix for RVC description
• 8295396: RISC-V: Cleanup useless CompressibleRegions
• 8305512: RISC-V: Enable RVC extension by default on

The original patch cannot be directly applied because of riscv-port-jdk11u do not have ZGC andsome minor conflict resolution.
Another conflict is that we do not have the refactoring 8295270: RISC-V: Clean up and refactoring for assembler functions on 11u.

It's also worth mentioning that there are some changes to the 8295110 implementation because jdk11u uses gnu++98 which cannot use lambda.

Testing:

• Tier1 passed without new failure on lp4a (release).

---

Progress

• Change must be properly reviewed (1 review required, with at least 1 Reviewer)
• Change must not contain extraneous whitespace
• Commit message must refer to an issue

Issues

• JDK-8295110: RISC-V: Mark out relocations as incompressible (Enhancement - P4)
• JDK-8305112: RISC-V: Typo fix for RVC description (Enhancement - P5)
• JDK-8295396: RISC-V: Cleanup useless CompressibleRegions (Enhancement - P4)
• JDK-8305512: RISC-V: Enable RVC extension by default on supported hardware (Enhancement - P4)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/riscv-port-jdk11u.git pull/45/head:pull/45
$ git checkout pull/45

Update a local copy of the PR:
$ git checkout pull/45
$ git pull https://git.openjdk.org/riscv-port-jdk11u.git pull/45/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 45

View PR using the GUI difftool:
$ git pr show -t 45

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/riscv-port-jdk11u/pull/45.diff

Using Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back dzhang! A progress list of the required criteria for merging this PR into riscv-port will be added to the body of your pull request. There are additional pull request commands available for use with this pull request.

[openjdk]

❗ This change is not yet ready to be integrated.
See the Progress checklist in the description for automated requirements.

[openjdk]

This backport pull request has now been updated with issue from the original commit.

[DingliZhang]

/issue 8305112 8295396 8305512

[openjdk]

@DingliZhang
Adding additional issue to issue list: 8305112: RISC-V: Typo fix for RVC description.

Adding additional issue to issue list: 8295396: RISC-V: Cleanup useless CompressibleRegions.

Adding additional issue to issue list: 8305512: RISC-V: Enable RVC extension by default on supported hardware.

[DingliZhang]

Testing of fastdebug is ongoing, I will update later.

[mlbridge]

Webrevs

• 00: Full (6f50d54b)