[clang-tools-extra] [clang-tidy] Make readability-redundant-inline-specifier diagnose `static inline` outside header files (PR #223501)

[via cfe-commits]

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@@ -29,3 +29,9 @@ defined entirely inside a class/struct/union definition are implicitly inlined.
 When `true`, the check will also flag functions and variables that
 already have internal linkage as redundant. Default is `false`.
 ```
+
+```{option} DiagnoseStaticInline
+
+If set to `true`, the check will flag ``static inline`` symbols declared
+outside of header files and suggest dropping the ``inline`` specifier.
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higher-performance wrote:

Fixed, thanks!

https://github.com/llvm/llvm-project/pull/223501