[clang] [clang-cl] Document behavior difference of strict aliasing in clang-cl vs clang. (PR #68460)

[via cfe-commits]

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@@ -3152,7 +3152,8 @@ defm diagnostics_show_line_numbers : BoolFOption<"diagnostics-show-line-numbers"
 def fno_stack_protector : Flag<["-"], "fno-stack-protector">, Group<f_Group>,
   HelpText<"Disable the use of stack protectors">;
 def fno_strict_aliasing : Flag<["-"], "fno-strict-aliasing">, Group<f_Group>,
-  Flags<[NoXarchOption]>, Visibility<[ClangOption, CLOption, DXCOption]>;
+  Flags<[NoXarchOption]>, Visibility<[ClangOption, CLOption, DXCOption]>,
+  HelpText<"Disable optimizations based on strict aliasing rules (default)">;
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zmodem wrote:

Since the defaultness depends on which driver mode is used (clang-cl or regular clang), we should probably leave out the `(default)` part.

https://github.com/llvm/llvm-project/pull/68460