[clang] [LifetimeSafety] Warn on incorrectly placed `[[clang::lifetimebound]]` attributes (PR #196144)

[Gábor Horváth via cfe-commits]

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@@ -467,6 +467,7 @@ enables only the high-confidence subset of these checks.
 * ``-Wlifetime-safety-validations``: Enables checks that validate existing lifetime annotations.
 
   * ``-Wlifetime-safety-noescape``: Warns when a parameter marked with ``[[clang::noescape]]`` escapes the function.
+  * ``-Wlifetime-safety-lifetimebound-violation``: Warns when a parameter marked with ``[[clang::lifetimebound]]`` is not returned from the function.
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Xazax-hun wrote:

Nit: we should also change the "returned" here. 

https://github.com/llvm/llvm-project/pull/196144