Matthias Krüger 6464e5b78c
Rollup merge of #123075 - rcvalle:rust-cfi-fix-drop-drop-in-place, r=compiler-errors
CFI: Fix drop and drop_in_place

Fix drop and drop_in_place by transforming self of drop and drop_in_place methods into a Drop trait objects.

This was split off from https://github.com/rust-lang/rust/pull/116404.

cc `@compiler-errors` `@workingjubilee`
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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