[clang] [coroutine] Suppress unreachable-code warning on coroutine statements. (PR #77454)

[Utkarsh Saxena via cfe-commits]

================
@@ -33,33 +40,37 @@ task test3() {
 
 task test4() {
   abort();
-  1; // expected-warning {{code will never be executed}}
+  1;  // expected-warning {{code will never be executed}}
   co_return;
 }
 
-
 task test5() {
   abort();
-  co_await std::suspend_never{};
+  co_await 1;
 }
 
 task test6() {
   abort();
-  1; // expected-warning {{code will never be executed}}
-  co_await std::suspend_never{};
+  1;  // expected-warning {{code will never be executed}}
+  co_await 3;
 }
 
 task test7() {
   // coroutine statements are not considered unreachable.
-  co_await std::suspend_never{};
+  co_await 1;
   abort();
-  co_await std::suspend_never{};
+  co_await 2;
 }
 
 task test8() {
   // coroutine statements are not considered unreachable.
-  // co_await std::suspend_never{};
   abort();
   co_return;
-  1 + 1; // expected-warning {{code will never be executed}}
+  1 + 1;  // expected-warning {{code will never be executed}}
+}
+
+task test9() {
+  abort();
+  // This warning is emit on the declaration itself, rather the coroutine 
substmt.
----------------
usx95 wrote:
s/emit/emitted

https://github.com/llvm/llvm-project/pull/77454
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