[clang] Remove redundant typename (NFC) (#167207)

Identified with readability-redundant-typename.

Author: kazutakahirata

clang/include/clang/AST/DeclBase.h

@@ -2642,7 +2642,7 @@ class DeclContext {
 
   using udir_iterator_base =
       llvm::iterator_adaptor_base<udir_iterator, lookup_iterator,
-                                  typename lookup_iterator::iterator_category,
+                                  lookup_iterator::iterator_category,
                                   UsingDirectiveDecl *>;
 
   struct udir_iterator : udir_iterator_base {

clang/lib/StaticAnalyzer/Checkers/BlockInCriticalSectionChecker.cpp

@@ -270,8 +270,7 @@ REGISTER_LIST_WITH_PROGRAMSTATE(ActiveCritSections, CritSectionMarker)
 // TODO: Move these to llvm::ImmutableList when overhauling immutable data
 // structures for proper iterator concept support.
 template <>
-struct std::iterator_traits<
-    typename llvm::ImmutableList<CritSectionMarker>::iterator> {
+struct std::iterator_traits<llvm::ImmutableList<CritSectionMarker>::iterator> {
   using iterator_category = std::forward_iterator_tag;
   using value_type = CritSectionMarker;
   using difference_type = std::ptrdiff_t;