[clang] remove unused frontend flag -fretain-subst-template-type-parm-type-ast-nodes (#134177)

This is a follow-up to #132748, where we deferred the flag removal in
order to ease transition for external users.

The plan is to merge this in the nearish future, in two weeks or so is
my best guess.

Author: mizvekov

clang/include/clang/Basic/LangOptions.def

@@ -161,7 +161,6 @@ LANGOPT(Coroutines        , 1, 0, "C++20 coroutines")
 LANGOPT(CoroAlignedAllocation, 1, 0, "prefer Aligned Allocation according to P2014 Option 2")
 LANGOPT(DllExportInlines  , 1, 1, "dllexported classes dllexport inline methods")
 LANGOPT(ExperimentalLibrary, 1, 0, "enable unstable and experimental library features")
-LANGOPT(RetainSubstTemplateTypeParmTypeAstNodes, 1, 0, "retain SubstTemplateTypeParmType nodes in the AST's representation of alias template specializations")
 
 LANGOPT(PointerAuthIntrinsics, 1, 0, "pointer authentication intrinsics")
 LANGOPT(PointerAuthCalls  , 1, 0, "function pointer authentication")

clang/include/clang/Driver/Options.td

@@ -3509,12 +3509,6 @@ defm application_extension : BoolFOption<"application-extension",
   PosFlag<SetTrue, [], [ClangOption, CC1Option],
           "Restrict code to those available for App Extensions">,
   NegFlag<SetFalse>>;
-defm retain_subst_template_type_parm_type_ast_nodes : BoolFOption<"retain-subst-template-type-parm-type-ast-nodes",
-  LangOpts<"RetainSubstTemplateTypeParmTypeAstNodes">, DefaultFalse,
-  PosFlag<SetTrue, [], [CC1Option], "Enable">,
-  NegFlag<SetFalse, [], [], "Disable">,
-  BothFlags<[], [], " retain SubstTemplateTypeParmType nodes in the AST's representation"
-  " of alias template specializations">>;
 defm sized_deallocation : BoolFOption<"sized-deallocation",
   LangOpts<"SizedDeallocation">, Default<cpp14.KeyPath>,
   PosFlag<SetTrue, [], [], "Enable C++14 sized global deallocation functions">,