bors 2319be8e26 Auto merge of #119452 - AngelicosPhosphoros:make_nonzeroint_get_assume_nonzero, r=scottmcm
Add assume into `NonZeroIntX::get`

LLVM currently don't support range metadata for function arguments so it fails to optimize non zero integers using their invariant if they are provided using by-value function arguments.

Related to https://github.com/rust-lang/rust/issues/119422
Related to https://github.com/llvm/llvm-project/issues/76628
Related to https://github.com/rust-lang/rust/issues/49572
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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