[clang] [llvm] [Clang] Show inlining hints for __attribute__((warning/error)) (PR #174892)

[Nick Desaulniers via cfe-commits]

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@@ -8397,6 +8397,13 @@ pointing to precise locations of the call site in the source.
       dontcall(); // No Warning
     sizeof(dontcall()); // No Warning
   }
+
+When the call occurs through inlined functions, the
+``-fdiagnostics-show-inlining-chain=`` option can be used to show the
+inlining chain that led to the call. This helps identify which call site
+triggered the diagnostic when the attributed function is called from
+multiple locations through inline functions. See ``clang --help`` for
+available modes.
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nickdesaulniers wrote:

I don't think we want our HTML docs to say "run `clang --help` for the options."  This is our official docs, spell them out!!!

https://github.com/llvm/llvm-project/pull/174892