[Sema] Remove unused isNonTypeNestedNameSpecifier

[kazu]

Summary

The last use was removed by:

commit 04f131da0b19abff611773c03be9bafb53c753ce
Author: Richard Smith <[e-mail]>
Date:   Fri Jan 24 15:14:25 2020 -0800

[aaron.ballman]

LGTM, thank you for the cleanup!

clang/include/clang/Sema/Sema.h

struct NestedNameSpecInfo {
 
     NestedNameSpecInfo(IdentifierInfo *II, SourceLocation IdLoc,
                        SourceLocation ColonColonLoc, QualType ObjectType)
       : ObjectType(ParsedType::make(ObjectType)), Identifier(II),
         IdentifierLoc(IdLoc), CCLoc(ColonColonLoc) {
     }
   };
 
-  bool isNonTypeNestedNameSpecifier(Scope *S, CXXScopeSpec &SS,
-                                    NestedNameSpecInfo &IdInfo);
-
   bool BuildCXXNestedNameSpecifier(Scope *S,
                                    NestedNameSpecInfo &IdInfo,
                                    bool EnteringContext,
                                    CXXScopeSpec &SS,
                                    NamedDecl *ScopeLookupResult,
                                    bool ErrorRecoveryLookup,
                                    bool *IsCorrectedToColon = nullptr,
                                    bool OnlyNamespace = false);

clang/lib/Sema/SemaCXXScopeSpec.cpp

NamedDecl *Sema::FindFirstQualifierInScope(Scope *S, NestedNameSpecifier *NNS) {
 
   NamedDecl *Result = Found.getFoundDecl();
   if (isAcceptableNestedNameSpecifier(Result))
     return Result;
 
   return nullptr;
 }
 
-bool Sema::isNonTypeNestedNameSpecifier(Scope *S, CXXScopeSpec &SS,
-                                        NestedNameSpecInfo &IdInfo) {
-  QualType ObjectType = GetTypeFromParser(IdInfo.ObjectType);
-  LookupResult Found(*this, IdInfo.Identifier, IdInfo.IdentifierLoc,
-                     LookupNestedNameSpecifierName);
-
-  // Determine where to perform name lookup
-  DeclContext *LookupCtx = nullptr;
-  bool isDependent = false;
-  if (!ObjectType.isNull()) {
-    // This nested-name-specifier occurs in a member access expression, e.g.,
-    // x->B::f, and we are looking into the type of the object.
-    assert(!SS.isSet() && "ObjectType and scope specifier cannot coexist");
-    LookupCtx = computeDeclContext(ObjectType);
-    isDependent = ObjectType->isDependentType();
-  } else if (SS.isSet()) {
-    // This nested-name-specifier occurs after another nested-name-specifier,
-    // so long into the context associated with the prior nested-name-specifier.
-    LookupCtx = computeDeclContext(SS, false);
-    isDependent = isDependentScopeSpecifier(SS);
-    Found.setContextRange(SS.getRange());
-  }
-
-  if (LookupCtx) {
-    // Perform "qualified" name lookup into the declaration context we
-    // computed, which is either the type of the base of a member access
-    // expression or the declaration context associated with a prior
-    // nested-name-specifier.
-
-    // The declaration context must be complete.
-    if (!LookupCtx->isDependentContext() &&
-        RequireCompleteDeclContext(SS, LookupCtx))
-      return false;
-
-    LookupQualifiedName(Found, LookupCtx);
-  } else if (isDependent) {
-    return false;
-  } else {
-    LookupName(Found, S);
-  }
-  Found.suppressDiagnostics();
-
-  return Found.getAsSingle<NamespaceDecl>();
-}
-
 namespace {
 
 // Callback to only accept typo corrections that can be a valid C++ member
 // initializer: either a non-static field member or a base class.
 class NestedNameSpecifierValidatorCCC final
     : public CorrectionCandidateCallback {
 public:
   explicit NestedNameSpecifierValidatorCCC(Sema &SRef)