[lldb] Add empty implementation for TypeSystemSwift ptrauth methods

Adds empty implementations for `GetPtrAuthKey`,
`GetPtrAuthDiscriminator`, and `GetPtrAuthAddressDiversity`.

Author: bnbarham

lldb/source/Plugins/TypeSystem/Swift/TypeSystemSwift.cpp

@@ -137,6 +137,20 @@ lldb::Format TypeSystemSwift::GetFormat(opaque_compiler_type_t type) {
   return eFormatBytes;
 }
 
+unsigned TypeSystemSwift::GetPtrAuthKey(lldb::opaque_compiler_type_t type) {
+  return 0;
+}
+
+unsigned
+TypeSystemSwift::GetPtrAuthDiscriminator(lldb::opaque_compiler_type_t type) {
+  return 0;
+}
+
+bool TypeSystemSwift::GetPtrAuthAddressDiversity(
+    lldb::opaque_compiler_type_t type) {
+  return false;
+}
+
 namespace llvm {
 llvm::raw_ostream &
 operator<<(llvm::raw_ostream &os,

lldb/source/Plugins/TypeSystem/Swift/TypeSystemSwift.h

@@ -312,6 +312,11 @@ class TypeSystemSwift : public TypeSystem {
   CompilerType GetNonReferenceType(lldb::opaque_compiler_type_t type) override {
     return {};
   }
+
+  unsigned GetPtrAuthKey(lldb::opaque_compiler_type_t type) override;
+  unsigned GetPtrAuthDiscriminator(lldb::opaque_compiler_type_t type) override;
+  bool GetPtrAuthAddressDiversity(lldb::opaque_compiler_type_t type) override;
+
   /// \}
 protected:
   /// Used in the logs.