Add regression test for #90815 and improve `panicking()` docs#151675

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Airyshtoteles wants to merge 3 commits intorust-lang:mainfrom

Airyshtoteles:fix-issues-90815-151458

Commits on Jan 26, 2026

Add regression test for exhausted asm registers and improve panicking() docs
Airyshtoteles
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fix: use error-pattern for flexible error matching in register exhaustion test
Airyshtoteles
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fix: update regression test for #90815 with blessed stderr
Airyshtoteles
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