Replace string GNU Triples with llvm::Triple in MCSubtargetInfo and create*MCSubtargetInfo(). NFC.

Summary:
This continues the patch series to eliminate StringRef forms of GNU triples
from the internals of LLVM that began in r239036.

Reviewers: rafael

Reviewed By: rafael

Subscribers: rafael, ted, jfb, llvm-commits, rengolin, jholewinski

Differential Revision: http://reviews.llvm.org/D10311

llvm-svn: 239467
diff --git a/llvm/lib/Target/Mips/MipsSubtarget.h b/llvm/lib/Target/Mips/MipsSubtarget.h
index 0bfafc8..a47ba0d 100644
--- a/llvm/lib/Target/Mips/MipsSubtarget.h
+++ b/llvm/lib/Target/Mips/MipsSubtarget.h
@@ -161,9 +161,8 @@
 
   /// This constructor initializes the data members to match that
   /// of the specified triple.
-  MipsSubtarget(const std::string &TT, const std::string &CPU,
-                const std::string &FS, bool little,
-                const MipsTargetMachine &TM);
+  MipsSubtarget(const Triple &TT, const std::string &CPU, const std::string &FS,
+                bool little, const MipsTargetMachine &TM);
 
   /// ParseSubtargetFeatures - Parses features string setting specified
   /// subtarget options.  Definition of function is auto generated by tblgen.