[clang][NFC] Fix leftovers from LinkageSpecDecl::LanguageIDs refactoring

This fixes bot failure https://lab.llvm.org/buildbot/#/builders/139/builds/52622 introduced by 6576120

Author: Endilll

clang-tools-extra/clang-tidy/modernize/DeprecatedHeadersCheck.cpp

@@ -57,7 +57,7 @@ class ExternCRefutationVisitor
   bool shouldVisitLambdaBody() const { return false; }
 
   bool VisitLinkageSpecDecl(LinkageSpecDecl *LinkSpecDecl) const {
-    if (LinkSpecDecl->getLanguage() != LinkageSpecDecl::lang_c ||
+    if (LinkSpecDecl->getLanguage() != LinkageSpecLanguageIDs::C ||
         !LinkSpecDecl->hasBraces())
       return true;
 

clang-tools-extra/modularize/Modularize.cpp

@@ -574,10 +574,10 @@ class CollectEntitiesVisitor
     SourceRange BlockRange = D->getSourceRange();
     const char *LinkageLabel;
     switch (D->getLanguage()) {
-    case LinkageSpecDecl::lang_c:
+    case LinkageSpecLanguageIDs::C:
       LinkageLabel = "extern \"C\" {}";
       break;
-    case LinkageSpecDecl::lang_cxx:
+    case LinkageSpecLanguageIDs::CXX:
       LinkageLabel = "extern \"C++\" {}";
       break;
     }