llvm-project

ade43a54 - [WebAssembly] MC support for acquire-release atomics (#183656)

[WebAssembly] MC support for acquire-release atomics (#183656) Initial support for acquire-release atomics, specified as part of https://github.com/WebAssembly/shared-everything-threads This adds an ordering operand to atomic loads, stores, RMWs, wait/notify, and fences. It currently defaults to 0 and ISel is not updated yet, so atomics produced by the compiler will still always be seqcst. Asm parsing and printing, binary emission and disassembly are all updated. Binary emission will always use the old encoding because the encoding is smaller, and to get backwards compatibility for free.