[SourceKit] Move all options into a common options struct

With more options coming for incremental syntax parsing, the list of
arguments will grow way to large and unhandy, so just extract them into
one common struct.

tools/SourceKit/lib/SwiftLang/SwiftEditor.cpp

@@ -2027,7 +2027,6 @@ void SwiftEditorDocument::reportDocumentStructure(SourceFile &SrcFile,
 //===----------------------------------------------------------------------===//
 
 void SwiftLangSupport::editorOpen(StringRef Name, llvm::MemoryBuffer *Buf,
-                                  bool EnableSyntaxMap,
                                   EditorConsumer &Consumer,
                                   ArrayRef<const char *> Args) {
 
@@ -2084,7 +2083,8 @@ void SwiftLangSupport::editorClose(StringRef Name, bool RemoveCache) {
 // EditorReplaceText
 //===----------------------------------------------------------------------===//
 
-void SwiftLangSupport::editorReplaceText(StringRef Name, llvm::MemoryBuffer *Buf,
+void SwiftLangSupport::editorReplaceText(StringRef Name,
+                                         llvm::MemoryBuffer *Buf,
                                          unsigned Offset, unsigned Length,
                                          EditorConsumer &Consumer) {
   auto EditorDoc = EditorDocuments.getByUnresolvedName(Name);