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Stuart Cook
39a8f75d4c
Forbid `CHECK: br` and `CHECK-NOT: br` in codegen tests (suggest `br {{.*}}` instead)
`// CHECK-NOT: br` is fragile to false positives in mangled symbol names, while `// CHECK-NOT: br {{.*}}` is not. Remove and forbid the former in codegen tests, and suggest the latter.
cc https://github.com/rust-lang/rust/pull/149125#issuecomment-3560003847 where this caused a CI failure due to a v0 mangled symbol containing `br` in a disambiguator/crate hash/something.