Compute feature bits at time of MCSubtargetInfo initialization.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@134606 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Target/Alpha/AlphaSubtarget.h b/lib/Target/Alpha/AlphaSubtarget.h
index 847d495..70b3116 100644
--- a/lib/Target/Alpha/AlphaSubtarget.h
+++ b/lib/Target/Alpha/AlphaSubtarget.h
@@ -22,6 +22,7 @@
 #include "AlphaGenSubtargetInfo.inc"
 
 namespace llvm {
+class StringRe;
 
 class AlphaSubtarget : public AlphaGenSubtargetInfo {
 protected:
@@ -39,7 +40,7 @@
   
   /// ParseSubtargetFeatures - Parses features string setting specified 
   /// subtarget options.  Definition of function is auto generated by tblgen.
-  void ParseSubtargetFeatures(const std::string &FS, const std::string &CPU);
+  void ParseSubtargetFeatures(StringRef CPU, StringRef FS);
 
   bool hasCT() const { return HasCT; }
 };