Merge pull request llvm#10888 from charles-zablit/charles-zablit/lldb/add-has-methods-to-6.2

🍒  [lldb] upgrade HandleFrameFormatVariable callees to llvm::Expected

Author: adrian-prantl

lldb/include/lldb/Core/DemangledNameInfo.h

@@ -71,8 +71,28 @@ struct DemangledNameInfo {
 
   /// Returns \c true if this object holds a valid basename range.
   bool hasBasename() const {
+    // A function always has a name.
     return BasenameRange.second > BasenameRange.first;
   }
+
+  /// Returns \c true if this object holds a valid scope range.
+  bool hasScope() const { return ScopeRange.second >= ScopeRange.first; }
+
+  /// Returns \c true if this object holds a valid arguments range.
+  bool hasArguments() const {
+    return ArgumentsRange.second >= ArgumentsRange.first;
+  }
+
+  /// Returns \c true if this object holds a valid qualifiers range.
+  bool hasQualifiers() const {
+    return QualifiersRange.second >= QualifiersRange.first;
+  }
+
+  /// Returns \c true if this object holds a valid prefix range.
+  bool hasPrefix() const { return PrefixRange.second >= PrefixRange.first; }
+
+  /// Returns \c true if this object holds a valid suffix range.
+  bool hasSuffix() const { return SuffixRange.second >= SuffixRange.first; }
 };
 
 /// An OutputBuffer which keeps a record of where certain parts of a