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Rollup merge of #80525 - devsnek:wasm64, r=nagisa

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wasm64 support

There is still some upstream llvm work needed before this can land.
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Dylan DPC 2021-04-05 00:24:23 +02:00 • committed by GitHub
commit 0d12422f2d
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19 changed files with 129 additions and 18 deletions
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5
compiler/rustc_codegen_llvm/src/back/write.rs
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@ -170,10 +170,7 @@ pub fn target_machine_factory(
// On the wasm target once the `atomics` feature is enabled that means that
// we're no longer single-threaded, or otherwise we don't want LLVM to
// lower atomic operations to single-threaded operations.
if singlethread
&& sess.target.llvm_target.contains("wasm32")
&& sess.target_features.contains(&sym::atomics)
{
if singlethread && sess.target.is_like_wasm && sess.target_features.contains(&sym::atomics) {
singlethread = false;
}