[Clang][coro] Fix crash on emitting init suspend if the return type of await_resume() is not trivially destructible

Author: yuxuanchen1997

clang/lib/CodeGen/CGCoroutine.cpp

@@ -245,6 +245,15 @@ static LValueOrRValue emitSuspendExpression(CodeGenFunction &CGF, CGCoroData &Co
                                          FPOptionsOverride(), Loc, Loc);
     TryStmt = CXXTryStmt::Create(CGF.getContext(), Loc, TryBody, Catch);
     CGF.EnterCXXTryStmt(*TryStmt);
+    CGF.EmitStmt(TryBody);
+    // We don't use EmitCXXTryStmt here. We need to store to ResumeEHVar that
+    // doesn't exist in the body.
+    Builder.CreateFlagStore(false, Coro.ResumeEHVar);
+    CGF.ExitCXXTryStmt(*TryStmt);
+    LValueOrRValue Res;
+    // We are not supposed to obtain the value from init suspend await_resume().
+    Res.RV = RValue::getIgnored();
+    return Res;
   }
 
   LValueOrRValue Res;
@@ -253,11 +262,6 @@ static LValueOrRValue emitSuspendExpression(CodeGenFunction &CGF, CGCoroData &Co
   else
     Res.RV = CGF.EmitAnyExpr(S.getResumeExpr(), aggSlot, ignoreResult);
 
-  if (TryStmt) {
-    Builder.CreateFlagStore(false, Coro.ResumeEHVar);
-    CGF.ExitCXXTryStmt(*TryStmt);
-  }
-
   return Res;
 }