Walk back commits for unused function parameters - they're still being

used via dragonegg for now.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@208016 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/MC/SubtargetFeature.h

@@ -78,7 +78,7 @@ public:
   std::string getString() const;
 
   /// Adding Features.
-  void AddFeature(const StringRef String);
+  void AddFeature(const StringRef String, bool IsEnabled = true);
 
   /// ToggleFeature - Toggle a feature and returns the newly updated feature
   /// bits.

lib/MC/SubtargetFeature.cpp

@@ -51,6 +51,18 @@ static inline bool isEnabled(const StringRef Feature) {
   return Ch == '+';
 }
 
+/// PrependFlag - Return a string with a prepended flag; '+' or '-'.
+///
+static inline std::string PrependFlag(const StringRef Feature,
+                                    bool IsEnabled) {
+  assert(!Feature.empty() && "Empty string");
+  if (hasFlag(Feature))
+    return Feature;
+  std::string Prefix = IsEnabled ? "+" : "-";
+  Prefix += Feature;
+  return Prefix;
+}
+
 /// Split - Splits a string of comma separated items in to a vector of strings.
 ///
 static void Split(std::vector<std::string> &V, const StringRef S) {
@@ -97,11 +109,13 @@ static std::string Join(const std::vector<std::string> &V) {
 }
 
 /// Adding features.
-void SubtargetFeatures::AddFeature(const StringRef String) {
-  // Don't add empty features or features we already have.
-  if (!String.empty())
-    // Convert to lowercase, prepend flag if we don't already have a flag.
-    Features.push_back(hasFlag(String) ? String.str() : "+" + String.lower());
+void SubtargetFeatures::AddFeature(const StringRef String,
+                                   bool IsEnabled) {
+  // Don't add empty features
+  if (!String.empty()) {
+    // Convert to lowercase, prepend flag and add to vector
+    Features.push_back(PrependFlag(String.lower(), IsEnabled));
+  }
 }
 
 /// Find KV in array using binary search.