8274242: Implement fast-path for ASCII-compatible CharsetEncoders on x86

[cl4es]

Clean backport of JDK-8274242

---

Progress

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

Issue

• JDK-8274242: Implement fast-path for ASCII-compatible CharsetEncoders on x86

Reviewing

Using git

Checkout this PR locally:
$ git fetch https://git.openjdk.java.net/jdk17u pull/310/head:pull/310
$ git checkout pull/310

Update a local copy of the PR:
$ git checkout pull/310
$ git pull https://git.openjdk.java.net/jdk17u pull/310/head

Using Skara CLI tools

Checkout this PR locally:
$ git pr checkout 310

View PR using the GUI difftool:
$ git pr show -t 310

Using diff file

Download this PR as a diff file:
https://git.openjdk.java.net/jdk17u/pull/310.diff

[bridgekeeper]

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[openjdk]

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

[openjdk]

@cl4es This change now passes all automated pre-integration checks.

ℹ️ This project also has non-automated pre-integration requirements. Please see the file CONTRIBUTING.md for details.

After integration, the commit message for the final commit will be:

8274242: Implement fast-path for ASCII-compatible CharsetEncoders on x86

You can use pull request commands such as /summary, /contributor and /issue to adjust it as needed.

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[mlbridge]

Webrevs

• 00: Full (aa8e6001)

[cl4es]

/integrate

[openjdk]

Going to push as commit 14a1f2a.

[openjdk]

@cl4es Pushed as commit 14a1f2a.

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