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/MSP430/MSP430Subtarget.h b/llvm/lib/Target/MSP430/MSP430Subtarget.h
index 30d46d3..81f6f02 100644
--- a/llvm/lib/Target/MSP430/MSP430Subtarget.h
+++ b/llvm/lib/Target/MSP430/MSP430Subtarget.h
@@ -41,7 +41,7 @@
   /// This constructor initializes the data members to match that
   /// of the specified triple.
   ///
-  MSP430Subtarget(const std::string &TT, const std::string &CPU,
+  MSP430Subtarget(const Triple &TT, const std::string &CPU,
                   const std::string &FS, const TargetMachine &TM);
 
   MSP430Subtarget &initializeSubtargetDependencies(StringRef CPU, StringRef FS);