[CIR] Change unreachable to diagnostic for ill-equipped clang#152614

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JustinStitt merged 2 commits intollvm:mainfrom

JustinStitt:fix-cir-crash

Sep 17, 2025

Commits on Aug 7, 2025

[CIR] Replace unreachable with diagnostic when not built with
JustinStitt
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Commits on Aug 8, 2025

use UNSUPPORTED over REQUIRES in lit test
JustinStitt
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