8256215: Shenandoah: re-organize saving/restoring machine state in assembler code

[shipilev]

This unbreaks x86_32 tests with Shenandoah.

Additional testing:

• Linux x86_64 fastdebug tier1,2
• Linux x86_32 fastdebug tier1,2 -XX:+UseShenandoahGC -XX:+UseSSE=1
• Linux x86_32 fastdebug tier1,2 -XX:+UseShenandoahGC -XX:+UseSSE=2

---

Progress

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

Issue

• JDK-8256215: Shenandoah: re-organize saving/restoring machine state in assembler code

Download

$ git fetch https://git.openjdk.java.net/jdk16u pull/69/head:pull/69
$ git checkout pull/69

[bridgekeeper]

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[openjdk]

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

[openjdk]

@shipilev 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:

8256215: Shenandoah: re-organize saving/restoring machine state in assembler code

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[mlbridge]

Webrevs

• 01: Full - Incremental (5f82707)
• 00: Full (1a010fe)

[shipilev]

/integrate

[openjdk]

@shipilev Pushed as commit 12f505a.

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