8293474: RISC-V: Unify the way of moving function pointer

[DingliZhang]

Please review this backport to riscv-port-jdk17u.
Backport of JDK-8293474.
The original patch cannot be directly applied because of #32 , and there are no other additional changes.

Testing:

• Tier1-3 passed without new failure on unmacthed (release).

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Progress

• Change must not contain extraneous whitespace
• Commit message must refer to an issue
• Change must be properly reviewed

Error

 ⚠️ This PR only contains changes already present in the target

Issue

• JDK-8293474: RISC-V: Unify the way of moving function pointer

Reviewers

• Fei Yang (@RealFYang - Committer)

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.org/riscv-port-jdk17u.git pull/35/head:pull/35
$ git checkout pull/35

Update a local copy of the PR:
$ git checkout pull/35
$ git pull https://git.openjdk.org/riscv-port-jdk17u.git pull/35/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 35

View PR using the GUI difftool:
$ git pr show -t 35

Using diff file

Download this PR as a diff file:
https://git.openjdk.org/riscv-port-jdk17u/pull/35.diff

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

[mlbridge]

Webrevs

• 00: Full (89267d16)

[RealFYang]

Looks good. Thanks.