RFR: 8377726: Remove unused macros in register.hpp

[Albert Mingkun Yang]

On Thu, 12 Feb 2026 06:06:14 GMT, Kim Barrett <kbarrett at openjdk.org> wrote:

> Please review this change to remove some unused (or nearly unused) macros in
> share/asm/register.hpp. This change also simplifies the zero definition of
> noreg to render one of the macros no longer used.
> 
> Testing: mach5 tier1 and GHA Sanity Tests.
> The GHA testing failed to build on Alpine Linux because of the unrelated
> https://bugs.openjdk.org/browse/JDK-8377707

Marked as reviewed by ayang (Reviewer).

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PR Review: https://git.openjdk.org/jdk/pull/29685#pullrequestreview-3819989556