[sourcekitd] Remove dead method for checking invalid loc diagnostics

Author: benlangmuir

tools/SourceKit/lib/SwiftLang/SwiftEditor.cpp

@@ -82,8 +82,6 @@ void EditorDiagConsumer::handleDiagnostic(
     return;
 
   if (Loc.isInvalid()) {
-    if (Kind == DiagnosticKind::Error)
-      HadInvalidLocError = true;
     clearLastDiag();
     return;
   }

tools/SourceKit/lib/SwiftLang/SwiftEditorDiagConsumer.h

@@ -40,7 +40,6 @@ class EditorDiagConsumer : public swift::DiagnosticConsumer {
     return BufferDiagnostics[LastDiagBufferID][LastDiagIndex];
   }
 
-  bool HadInvalidLocError = false;
   bool HadAnyError = false;
 
 public:
@@ -64,8 +63,6 @@ class EditorDiagConsumer : public swift::DiagnosticConsumer {
 
   void getAllDiagnostics(SmallVectorImpl<DiagnosticEntryInfo> &Result);
 
-  bool hadErrorWithInvalidLoc() const { return HadInvalidLocError; }
-
   bool hadAnyError() const { return HadAnyError; }
 
   void handleDiagnostic(swift::SourceManager &SM, swift::SourceLoc Loc,