Files
rust/tests/codegen-llvm
Stuart Cook 39a8f75d4c Rollup merge of #149190 - zachs18:chilly, r=Mark-Simulacrum
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.
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The files here use the LLVM FileCheck framework, documented at https://llvm.org/docs/CommandGuide/FileCheck.html.

One extension worth noting is the use of revisions as custom prefixes for FileCheck. If your codegen test has different behavior based on the chosen target or different compiler flags that you want to exercise, you can use a revisions annotation, like so:

// revisions: aaa bbb
// [bbb] compile-flags: --flags-for-bbb

After specifying those variations, you can write different expected, or explicitly unexpected output by using <prefix>-SAME: and <prefix>-NOT:, like so:

// CHECK: expected code
// aaa-SAME: emitted-only-for-aaa
// aaa-NOT:                        emitted-only-for-bbb
// bbb-NOT:  emitted-only-for-aaa
// bbb-SAME:                       emitted-only-for-bbb