Also parse "none" for non-IR inputs

Author: jansvoboda11

clang/include/clang/Driver/Options.td

@@ -2176,9 +2176,9 @@ def fwasm_exceptions : Flag<["-"], "fwasm-exceptions">, Group<f_Group>,
   HelpText<"Use WebAssembly style exceptions">;
 def exception_model : Separate<["-"], "exception-model">,
   Visibility<[CC1Option]>, HelpText<"The exception model">,
-  Values<"dwarf,sjlj,seh,wasm">,
+  Values<"dwarf,sjlj,seh,wasm,none">,
   NormalizedValuesScope<"CodeGenOptions::ExceptionHandlingKind">,
-  NormalizedValues<["DwarfCFI", "SjLj", "WinEH", "Wasm"]>,
+  NormalizedValues<["DwarfCFI", "SjLj", "WinEH", "Wasm", "None"]>,
   MarshallingInfoEnum<CodeGenOpts<"ExceptionHandling">, "None">;
 def exception_model_EQ : Joined<["-"], "exception-model=">,
   Visibility<[CC1Option]>, Alias<exception_model>;