Files
rust/tests/codegen
bors 15c4ccef03 Auto merge of #139940 - matthiaskrgr:rollup-rd4d3fn, r=matthiaskrgr
Rollup of 9 pull requests

Successful merges:

 - #135340 (Add `explicit_extern_abis` Feature and Enforce Explicit ABIs)
 - #139440 (rustc_target: RISC-V: feature addition batch 2)
 - #139667 (cfi: Remove #[no_sanitize(cfi)] for extern weak functions)
 - #139828 (Don't require rigid alias's trait to hold)
 - #139854 (Improve parse errors for stray lifetimes in type position)
 - #139889 (Clean UI tests 3 of n)
 - #139894 (Fix `opt-dist` CLI flag and make it work without LLD)
 - #139900 (stepping into impls for normalization is unproductive)
 - #139915 (replace some #[rustc_intrinsic] usage with use of the libcore declarations)

r? `@ghost`
`@rustbot` modify labels: rollup
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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