Add package in code completion override lookup

Author: elsh

include/swift/IDE/CodeCompletionString.h

@@ -32,7 +32,7 @@ class CodeCompletionStringChunk {
 
 public:
   enum class ChunkKind {
-    /// "open", "public", "internal", "fileprivate", or "private".
+    /// "open", "public", "package", "internal", "fileprivate", or "private".
     AccessControlKeyword,
 
     /// such as @"available".

include/swift/IDE/CompletionOverrideLookup.h

@@ -53,6 +53,7 @@ class CompletionOverrideLookup : public swift::VisibleDeclConsumer {
     hasAccessModifier = isKeywordSpecified("private") ||
                         isKeywordSpecified("fileprivate") ||
                         isKeywordSpecified("internal") ||
+                        isKeywordSpecified("package") ||
                         isKeywordSpecified("public") ||
                         isKeywordSpecified("open");
     hasOverride = isKeywordSpecified("override");