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/BPF/BPFSubtarget.h b/llvm/lib/Target/BPF/BPFSubtarget.h
index 347cffd8..5ad58db 100644
--- a/llvm/lib/Target/BPF/BPFSubtarget.h
+++ b/llvm/lib/Target/BPF/BPFSubtarget.h
@@ -38,8 +38,8 @@
 public:
   // This constructor initializes the data members to match that
   // of the specified triple.
-  BPFSubtarget(const std::string &TT, const std::string &CPU,
-               const std::string &FS, const TargetMachine &TM);
+  BPFSubtarget(const Triple &TT, const std::string &CPU, const std::string &FS,
+               const TargetMachine &TM);
 
   // ParseSubtargetFeatures - Parses features string setting specified
   // subtarget options.  Definition of function is auto generated by tblgen.