[clang] [CIR] Add support for storing into _Atomic variables (PR #165872)

[Sirui Mu via cfe-commits]

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@@ -815,6 +857,85 @@ RValue CIRGenFunction::emitAtomicExpr(AtomicExpr *e) {
       e->getExprLoc());
 }
 
+void CIRGenFunction::emitAtomicStore(RValue rvalue, LValue dest, bool isInit) {
+  bool isVolatile = dest.isVolatileQualified();
+  cir::MemOrder order;
+  if (dest.getType()->isAtomicType()) {
+    order = cir::MemOrder::SequentiallyConsistent;
+  } else {
+    order = cir::MemOrder::Release;
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Lancern wrote:

Looks like this path is for MSVC mode. Replaced it with a missing feature guard.

https://github.com/llvm/llvm-project/pull/165872