[clang] [AIX][TOC] Add -mtocdata/-mno-tocdata options on AIX (PR #67999)

[Fangrui Song via cfe-commits]

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@@ -93,6 +93,8 @@ def err_fe_backend_error_attr :
 def warn_fe_backend_warning_attr :
   Warning<"call to '%0' declared with 'warning' attribute: %1">, BackendInfo,
   InGroup<BackendWarningAttributes>;
+def warn_toc_unsupported_type : Warning<"The -mtocdata option is ignored "
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MaskRay wrote:

Please check the existing diagnostic style. They do not use capitalization or trailing period.
"the" is often omitted.

-mtocdata is ignored for ... because ...

https://github.com/llvm/llvm-project/pull/67999