[clang] Surface error for plain return statement in coroutine earlier (PR #100985)

[Ilya Biryukov via cfe-commits]

================
@@ -291,6 +294,38 @@ void mixed_coreturn_template2(bool b, T) {
     return; // expected-error {{not allowed in coroutine}}
 }
 
+struct promise_handle;
+
+struct Handle : std::coroutine_handle<promise_handle> { // expected-note 
2{{candidate constructor (the implicit copy constructor) not viable}}
----------------
ilya-biryukov wrote:

NIT: for brevity we could use a shorter substring (same below)
```suggestion
struct Handle : std::coroutine_handle<promise_handle> { // expected-note 2{{not 
viable}}
```

https://github.com/llvm/llvm-project/pull/100985
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