[NFC] Remove unused ASTWriter::getTypeID

As the title suggests, the `ASTWriter:getTypeID` method is not used.
This patch removes it.

Author: ChuanqiXu9

clang/include/clang/Serialization/ASTWriter.h

@@ -715,9 +715,6 @@ class ASTWriter : public ASTDeserializationListener,
   /// Force a type to be emitted and get its ID.
   serialization::TypeID GetOrCreateTypeID(QualType T);
 
-  /// Determine the type ID of an already-emitted type.
-  serialization::TypeID getTypeID(QualType T) const;
-
   /// Find the first local declaration of a given local redeclarable
   /// decl.
   const Decl *getFirstLocalDecl(const Decl *D);

clang/lib/Serialization/ASTCommon.h

@@ -46,30 +46,6 @@ enum DeclUpdateKind {
 
 TypeIdx TypeIdxFromBuiltin(const BuiltinType *BT);
 
-template <typename IdxForTypeTy>
-TypeID MakeTypeID(ASTContext &Context, QualType T, IdxForTypeTy IdxForType) {
-  if (T.isNull())
-    return PREDEF_TYPE_NULL_ID;
-
-  unsigned FastQuals = T.getLocalFastQualifiers();
-  T.removeLocalFastQualifiers();
-
-  if (T.hasLocalNonFastQualifiers())
-    return IdxForType(T).asTypeID(FastQuals);
-
-  assert(!T.hasLocalQualifiers());
-
-  if (const BuiltinType *BT = dyn_cast<BuiltinType>(T.getTypePtr()))
-    return TypeIdxFromBuiltin(BT).asTypeID(FastQuals);
-
-  if (T == Context.AutoDeductTy)
-    return TypeIdx(PREDEF_TYPE_AUTO_DEDUCT).asTypeID(FastQuals);
-  if (T == Context.AutoRRefDeductTy)
-    return TypeIdx(PREDEF_TYPE_AUTO_RREF_DEDUCT).asTypeID(FastQuals);
-
-  return IdxForType(T).asTypeID(FastQuals);
-}
-
 unsigned ComputeHash(Selector Sel);
 
 /// Retrieve the "definitive" declaration that provides all of the

clang/lib/Serialization/ASTWriter.cpp

@@ -6074,6 +6074,31 @@ void ASTWriter::AddTypeRef(QualType T, RecordDataImpl &Record) {
   Record.push_back(GetOrCreateTypeID(T));
 }
 
+template <typename IdxForTypeTy>
+static TypeID MakeTypeID(ASTContext &Context, QualType T,
+                         IdxForTypeTy IdxForType) {
+  if (T.isNull())
+    return PREDEF_TYPE_NULL_ID;
+
+  unsigned FastQuals = T.getLocalFastQualifiers();
+  T.removeLocalFastQualifiers();
+
+  if (T.hasLocalNonFastQualifiers())
+    return IdxForType(T).asTypeID(FastQuals);
+
+  assert(!T.hasLocalQualifiers());
+
+  if (const BuiltinType *BT = dyn_cast<BuiltinType>(T.getTypePtr()))
+    return TypeIdxFromBuiltin(BT).asTypeID(FastQuals);
+
+  if (T == Context.AutoDeductTy)
+    return TypeIdx(PREDEF_TYPE_AUTO_DEDUCT).asTypeID(FastQuals);
+  if (T == Context.AutoRRefDeductTy)
+    return TypeIdx(PREDEF_TYPE_AUTO_RREF_DEDUCT).asTypeID(FastQuals);
+
+  return IdxForType(T).asTypeID(FastQuals);
+}
+
 TypeID ASTWriter::GetOrCreateTypeID(QualType T) {
   assert(Context);
   return MakeTypeID(*Context, T, [&](QualType T) -> TypeIdx {
@@ -6097,19 +6122,6 @@ TypeID ASTWriter::GetOrCreateTypeID(QualType T) {
   });
 }
 
-TypeID ASTWriter::getTypeID(QualType T) const {
-  assert(Context);
-  return MakeTypeID(*Context, T, [&](QualType T) -> TypeIdx {
-    if (T.isNull())
-      return TypeIdx();
-    assert(!T.getLocalFastQualifiers());
-
-    TypeIdxMap::const_iterator I = TypeIdxs.find(T);
-    assert(I != TypeIdxs.end() && "Type not emitted!");
-    return I->second;
-  });
-}
-
 void ASTWriter::AddEmittedDeclRef(const Decl *D, RecordDataImpl &Record) {
   if (!wasDeclEmitted(D))
     return;