[rustllvm] Use report_fatal_error over llvm_unreachable #46124
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This makes it more robust when assertions are disabled, crashing instead of causing UB. Also introduces a tidy check to enforce this rule, which in turn necessitated making tidy run on src/rustllvm. Fixes rust-lang#44020
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[rustllvm] Use report_fatal_error over llvm_unreachable This makes it more robust when assertions are disabled, crashing instead of causing UB. Also introduces a tidy check to enforce this rule, which in turn necessitated making tidy run on `src/rustllvm`. Fixes rust-lang#44020
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This makes it more robust when assertions are disabled, crashing instead of causing UB.
Also introduces a tidy check to enforce this rule, which in turn necessitated making tidy run on
src/rustllvm.Fixes #44020