[CodeCompletion] Remove ... and & from function filter names

The filter name of a function should match the spelling of the function
name according to the language except that we don't insert _ for unnamed
parameters because underscores are legal inside identifiers and we don't
want to introduce spurious matches (also, we keep the () on a
parameterless function for disambiguation).

rdar://problem/26118915

tools/SourceKit/lib/SwiftLang/CodeCompletionOrganizer.cpp

@@ -1180,6 +1180,8 @@ void CompletionBuilder::getFilterName(CodeCompletionString *str,
       case ChunkKind::DeclAttrParamEqual:
       case ChunkKind::Comma:
       case ChunkKind::Whitespace:
+      case ChunkKind::Ellipsis:
+      case ChunkKind::Ampersand:
         continue;
       case ChunkKind::CallParameterColon:
         // Since we don't add the type, also don't add the space after ':'.