bors b9be3c47e5 Auto merge of #117457 - daxpedda:wasm-nontrapping-fptoint, r=wesleywiser
Stabilize Wasm target features that are in phase 4 and 5

This stabilizes the Wasm target features that are known to be working and in [phase 4 and 5](04fa8c810e).

Feature stabilized:
- [Non-trapping float-to-int conversions](https://github.com/WebAssembly/nontrapping-float-to-int-conversions)
- [Import/Export of Mutable Globals](https://github.com/WebAssembly/mutable-global)
- [Sign-extension operators](https://github.com/WebAssembly/sign-extension-ops)
- [Bulk memory operations](https://github.com/WebAssembly/bulk-memory-operations)
- [Extended Constant Expressions](https://github.com/WebAssembly/extended-const)

Features not stabilized:
- [Multi-value](https://github.com/WebAssembly/multi-value): requires rebuilding `std` #73755.
- [Reference Types](https://github.com/WebAssembly/reference-types): no point stabilizing without #103516.
- [Threads](https://github.com/webassembly/threads): requires rebuilding `std` #77839.
- [Relaxed SIMD](https://github.com/WebAssembly/relaxed-simd): separate PR #117468.
- [Multi Memory](https://github.com/WebAssembly/multi-memory): not implemented.

See https://github.com/rust-lang/rust/pull/117457#issuecomment-1787648070 for more context.

Documentation: https://github.com/rust-lang/reference/pull/1420
Tracking issue: https://github.com/rust-lang/rust/issues/44839
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UI Tests

This folder contains rustc's UI tests.

Test Directives (Headers)

Typically, a UI test will have some test directives / headers which are special comments that tell compiletest how to build and intepret a test.

As part of an on-going effort to rewrite compiletest (see https://github.com/rust-lang/compiler-team/issues/536), a major change proposal to change legacy compiletest-style headers // <directive> to ui_test-style headers //@ <directive> was accepted (see https://github.com/rust-lang/compiler-team/issues/512.

An example directive is ignore-test. In legacy compiletest style, the header would be written as

// ignore-test

but in ui_test style, the header would be written as

//@ ignore-test

compiletest is changed to accept only //@ directives for UI tests (currently), and will reject and report an error if it encounters any comments // <content> that may be parsed as an legacy compiletest-style test header. To fix this, you should migrate to the ui_test-style header //@ <content>.