[clang] [llvm] [coroutine] Implement llvm.coro.await.suspend intrinsic (PR #79712)

[Chuanqi Xu via cfe-commits]

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@@ -232,16 +237,59 @@ static LValueOrRValue emitSuspendExpression(CodeGenFunction &CGF, CGCoroData &Co
   auto *NullPtr = llvm::ConstantPointerNull::get(CGF.CGM.Int8PtrTy);
   auto *SaveCall = Builder.CreateCall(CoroSave, {NullPtr});
 
-  CGF.CurCoro.InSuspendBlock = true;
-  auto *SuspendRet = CGF.EmitScalarExpr(S.getSuspendExpr());
-  CGF.CurCoro.InSuspendBlock = false;
+  const auto AwaitSuspendCanThrow =
+      AwaitSuspendStmtCanThrow(S.getSuspendExpr());
+
+  auto SuspendHelper = CodeGenFunction(CGF.CGM).generateAwaitSuspendHelper(
+      CGF.CurFn->getName(), Prefix, S, AwaitSuspendCanThrow);
 
-  if (SuspendRet != nullptr && SuspendRet->getType()->isIntegerTy(1)) {
-    // Veto suspension if requested by bool returning await_suspend.
-    BasicBlock *RealSuspendBlock =
-        CGF.createBasicBlock(Prefix + Twine(".suspend.bool"));
-    CGF.Builder.CreateCondBr(SuspendRet, RealSuspendBlock, ReadyBlock);
-    CGF.EmitBlock(RealSuspendBlock);
+  llvm::CallBase *SuspendRet = nullptr;
+
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ChuanqiXu9 wrote:

We need comment here about the emitted code.  Originally this is commented in the above the function but I can't inline comments that due the review system of GH...

https://github.com/llvm/llvm-project/pull/79712