[clang] [LifetimeSafety] Add report on misuse of clang::noescape (PR #177260)

[Gábor Horváth via cfe-commits]

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@@ -10834,6 +10834,12 @@ def warn_lifetime_safety_cross_tu_suggestion
 
 def note_lifetime_safety_suggestion_returned_here : Note<"param returned here">;
 
+def warn_lifetime_safety_noescape_escapes
+    : Warning<
+          "parameter is marked [[clang::noescape]] but escapes through return">,
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Xazax-hun wrote:

I wonder if we can eliminate the `through return` part from the warning message since we already add a note about the return. 

https://github.com/llvm/llvm-project/pull/177260