[clang] [clang] Make -fveclib={ArmPL, SLEEF} imply -fno-math-errno (PR #112580)

[Kiran Chandramohan via cfe-commits]

================
@@ -3410,7 +3410,8 @@ def fno_experimental_isel : Flag<["-"], 
"fno-experimental-isel">, Group<f_clang_
   Alias<fno_global_isel>;
 def fveclib : Joined<["-"], "fveclib=">, Group<f_Group>,
   Visibility<[ClangOption, CC1Option, FlangOption, FC1Option]>,
-    HelpText<"Use the given vector functions library">,
+    HelpText<"Use the given vector functions library."
+             "Note: In clang -fveclib={ArmPL,SLEEF} implies -fno-math-errno">,
----------------
kiranchandramohan wrote:

There is a way to specify help separately for Clang. 
`HelpTextForVariants<[ClangOption,CC1Option]`

https://github.com/llvm/llvm-project/pull/112580
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