[clang] [Clang] Coroutines: Properly Check if `await_suspend` return type is a `std::coroutine_handle` (PR #85684)

[Chuanqi Xu via cfe-commits]

================
@@ -358,6 +364,30 @@ static Expr *maybeTailCall(Sema &S, QualType RetType, Expr 
*E,
   return S.MaybeCreateExprWithCleanups(JustAddress);
 }
 
+static bool isSpecializationOfCoroutineHandle(Sema &S, QualType Ty,
+                                              SourceLocation Loc) {
+  auto *CoroutineHandleClassTemplateDecl =
+      lookupCoroutineHandleTemplate(S, Loc);
----------------
ChuanqiXu9 wrote:

Maybe it can be better to cache the coroutine handle declaration to avoid 
redundant looking up. But it may be fine for the number of `await_suspend` in 
practical.

We can send another patch for this if we want.

https://github.com/llvm/llvm-project/pull/85684
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