[clang] [LifetimeSafety] Suggest lifetime annotations (PR #169767)

[Utkarsh Saxena via cfe-commits]

================
@@ -943,3 +943,73 @@ void parentheses(bool cond) {
   }  // expected-note 4 {{destroyed here}}
   (void)*p;  // expected-note 4 {{later used here}}
 }
+
+//===----------------------------------------------------------------------===//
+// Lifetimebound Annotation Suggestion Tests
+//===----------------------------------------------------------------------===//
+
+View return_view_directly (View a // expected-warning {{param should be marked [[clang::lifetimebound]]}}.
+) {
+  return a; // expected-note {{param escapes here}}
+}
+
+View conditional_return_view (
+    View a, // expected-warning {{param should be marked [[clang::lifetimebound]]}}.
+    View b,  // expected-warning {{param should be marked [[clang::lifetimebound]]}}.
+    bool c
+) {
----------------
usx95 wrote:

nit: Regarding formatting the function declaration:

```cpp
View conditional_return_view (
    View a,  // expected-warning {{param should be marked [[clang::lifetimebound]]}}.
    View b,  // expected-warning {{param should be marked [[clang::lifetimebound]]}}.
    bool c) {
```

https://github.com/llvm/llvm-project/pull/169767