[SourceKit] Omit internal parameters from filter name

The internal parameter names are just there to give an extra hint in the
source text for what the argument is. Consequently, we don't want to
allow filtering to match against them.

tools/SourceKit/lib/SwiftLang/CodeCompletionOrganizer.cpp

@@ -873,6 +873,7 @@ void CompletionBuilder::getFilterName(CodeCompletionString *str,
       bool shouldPrint = !C.isAnnotation();
       switch (C.getKind()) {
       case ChunkKind::TypeAnnotation:
+      case ChunkKind::CallParameterInternalName:
       case ChunkKind::CallParameterClosureType:
       case ChunkKind::CallParameterType:
       case ChunkKind::DeclAttrParamEqual: