Revert r247692: Replace Triple with a new TargetTuple in MCTargetDesc/* and related. NFC.

Eric has replied and has demanded the patch be reverted.

llvm-svn: 247702
diff --git a/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.h b/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.h
index ff00732..6b4abd5 100644
--- a/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.h
+++ b/llvm/lib/Target/ARM/MCTargetDesc/ARMAsmBackend.h
@@ -23,7 +23,7 @@
   bool isThumbMode;    // Currently emitting Thumb code.
   bool IsLittleEndian; // Big or little endian.
 public:
-  ARMAsmBackend(const Target &T, const TargetTuple &TT, bool IsLittle)
+  ARMAsmBackend(const Target &T, const Triple &TT, bool IsLittle)
       : MCAsmBackend(), STI(ARM_MC::createARMMCSubtargetInfo(TT, "", "")),
         isThumbMode(TT.getArchName().startswith("thumb")),
         IsLittleEndian(IsLittle) {}