[clangd] use printQualifiedName to skip the inlinenamespace qualifiers.

[hokein]

Summary

symbols in libcpp are inside the inline namespace, printQualifierAsString will
print the inline namespace, which is unexpected.

clang-tools-extra/clangd/refactor/Rename.cpp

bool isBlacklisted(const NamedDecl &RenameDecl) {
   if (isProtoFile(RenameDecl.getLocation(),
                   RenameDecl.getASTContext().getSourceManager()))
     return true;
   static const auto *StdSymbols = new llvm::DenseSet<llvm::StringRef>({
 #define SYMBOL(Name, NameSpace, Header) {#NameSpace #Name},
 #include "StdSymbolMap.inc"
 #undef SYMBOL
   });
-  return StdSymbols->count(RenameDecl.getQualifiedNameAsString());
+  return StdSymbols->count(printQualifiedName(RenameDecl));
 }
 
 enum ReasonToReject {
   NoSymbolFound,
   NoIndexProvided,
   NonIndexable,
   UsedOutsideFile, // for within-file rename only.
   UnsupportedSymbol,

clang-tools-extra/clangd/unittests/RenameTests.cpp

Case Cases[] = {
        "used outside main file", !HeaderFile, nullptr /*no index*/},
 
       {R"cpp(// disallow rename on blacklisted symbols (e.g. std symbols)
          namespace std {
          class str^ing {};
          }
        )cpp",
        "not a supported kind", !HeaderFile, Index},
+      {R"cpp(// disallow rename on blacklisted symbols (e.g. std symbols)
+         namespace std {
+         inline namespace __u {
+         class str^ing {};
+         }
+         }
+       )cpp",
+       "not a supported kind", !HeaderFile, Index},
 
       {R"cpp(
          void foo(int);
          void foo(char);
          template <typename T> void f(T t) {
            fo^o(t);
          })cpp",
        "multiple symbols", !HeaderFile, nullptr /*no index*/},