[Completion] Remove unused DocWords

The various keyword/recommended/etc fields were parsed and added to
completions, but never actually plumbed through SourceKit. Since they're
still unused and the implementation is not particularly lightweight,
just remove for now.

Resolves rdar://82464220

Author: bnbarham

include/swift/IDE/CodeCompletion.h

@@ -646,7 +646,6 @@ class CodeCompletionResult {
   StringRef SourceFilePath;
   StringRef BriefDocComment;
   ArrayRef<StringRef> AssociatedUSRs;
-  ArrayRef<std::pair<StringRef, StringRef>> DocWords;
   unsigned TypeDistance : 3;
   unsigned DiagnosticSeverity: 3;
   StringRef DiagnosticMessage;
@@ -731,15 +730,13 @@ class CodeCompletionResult {
                        CodeCompletionResult::NotRecommendedReason NotRecReason,
                        StringRef BriefDocComment,
                        ArrayRef<StringRef> AssociatedUSRs,
-                       ArrayRef<std::pair<StringRef, StringRef>> DocWords,
                        enum ExpectedTypeRelation TypeDistance)
       : Kind(ResultKind::Declaration), KnownOperatorKind(0),
         SemanticContext(unsigned(SemanticContext)), Flair(unsigned(Flair.toRaw())),
         NotRecommended(unsigned(NotRecReason)),
         NumBytesToErase(NumBytesToErase), CompletionString(CompletionString),
         ModuleName(ModuleName), BriefDocComment(BriefDocComment),
-        AssociatedUSRs(AssociatedUSRs), DocWords(DocWords),
-        TypeDistance(TypeDistance) {
+        AssociatedUSRs(AssociatedUSRs), TypeDistance(TypeDistance) {
     assert(AssociatedDecl && "should have a decl");
     AssociatedKind = unsigned(getCodeCompletionDeclKind(AssociatedDecl));
     IsSystem = getDeclIsSystem(AssociatedDecl);
@@ -762,7 +759,6 @@ class CodeCompletionResult {
                        CodeCompletionDiagnosticSeverity diagSeverity,
                        StringRef DiagnosticMessage, StringRef BriefDocComment,
                        ArrayRef<StringRef> AssociatedUSRs,
-                       ArrayRef<std::pair<StringRef, StringRef>> DocWords,
                        ExpectedTypeRelation TypeDistance,
                        CodeCompletionOperatorKind KnownOperatorKind)
       : Kind(ResultKind::Declaration),
@@ -772,8 +768,7 @@ class CodeCompletionResult {
         NumBytesToErase(NumBytesToErase), CompletionString(CompletionString),
         ModuleName(ModuleName), SourceFilePath(SourceFilePath),
         BriefDocComment(BriefDocComment), AssociatedUSRs(AssociatedUSRs),
-        DocWords(DocWords), TypeDistance(TypeDistance),
-        DiagnosticSeverity(unsigned(diagSeverity)),
+        TypeDistance(TypeDistance), DiagnosticSeverity(unsigned(diagSeverity)),
         DiagnosticMessage(DiagnosticMessage) {
     AssociatedKind = static_cast<unsigned>(DeclKind);
     assert(CompletionString);
@@ -869,10 +864,6 @@ class CodeCompletionResult {
     return AssociatedUSRs;
   }
 
-  ArrayRef<std::pair<StringRef, StringRef>> getDeclKeywords() const {
-    return DocWords;
-  }
-
   void setSourceFilePath(StringRef value) {
     SourceFilePath = value;
   }