RFR: 8292878: x86: Make scratch register usage explicit in assembler code [v4]

[Aleksey Shipilev]

On Mon, 29 Aug 2022 17:08:39 GMT, Vladimir Ivanov <vlivanov at openjdk.org> wrote:

> @shipilev Aleksey, do you plan to look into x86_32-specific changes? Otherwise, I'll integrate the patch.

Missed this comment, sorry. Are you looking for a similar change on x86_32-specific code? I believe x86_32 code does not use scratch registers (they are `#define`-d to `noreg`), so there seem to be nothing to do. I see GHA infra barfed up on x86_32 tests, I'll run some tests locally.

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PR: https://git.openjdk.org/jdk/pull/10003