Matthias Krüger 2829c2725a
Rollup merge of #132777 - durin42:llvm-20-poison-prop, r=nikic
try_question_mark_nop: update test for LLVM 20

llvm/llvm-project@dd116369f6 changes the IR of this test in a way that I don't think is bad, but needs adjusting.

r? `@nikic`
`@rustbot` label: +llvm-main
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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