8294087: RISC-V: RVC: Fix a potential alignment issue and add more alignment assertions for the patchable calls/nops

[zifeihan]

Hi,
Please help review this backport to riscv-port-jdk11u.
Backport of JDK-8294087.
The original patch cannot be directly applied because of riscv-port-jdk11u do not have emit_entry_barrier_stub C2CodeStub and no JDK-8216557.

Testing

• Run tier1-tier3 tests on SOPHON SG2042 (fastdebug)

---

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

Issue

• JDK-8294087: RISC-V: RVC: Fix a potential alignment issue and add more alignment assertions for the patchable calls/nops (Bug - P2)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/riscv-port-jdk11u.git pull/22/head:pull/22
$ git checkout pull/22

Update a local copy of the PR:
$ git checkout pull/22
$ git pull https://git.openjdk.org/riscv-port-jdk11u.git pull/22/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 22

View PR using the GUI difftool:
$ git pr show -t 22

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/riscv-port-jdk11u/pull/22.diff

Webrev

Link to Webrev Comment

[bridgekeeper]

👋 Welcome back gcao! 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.

[mlbridge]

Webrevs

• 00: Full (a7251635)

[bridgekeeper]

@zifeihan This pull request has been inactive for more than 4 weeks and will be automatically closed if another 4 weeks passes without any activity. To avoid this, simply add a new comment to the pull request. Feel free to ask for assistance if you need help with progressing this pull request towards integration!

[bridgekeeper]

@zifeihan This pull request has been inactive for more than 8 weeks and will now be automatically closed. If you would like to continue working on this pull request in the future, feel free to reopen it! This can be done using the /open pull request command.