[Hexagon] Move BitTracker into the llvm namespace and remove redundant qualifications

No functional change intended.

llvm-svn: 242062
diff --git a/llvm/lib/Target/Hexagon/HexagonBitTracker.cpp b/llvm/lib/Target/Hexagon/HexagonBitTracker.cpp
index 8e4baf1..021e58a 100644
--- a/llvm/lib/Target/Hexagon/HexagonBitTracker.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonBitTracker.cpp
@@ -22,10 +22,11 @@
 
 typedef BitTracker BT;
 
-HexagonEvaluator::HexagonEvaluator(const llvm::HexagonRegisterInfo &tri,
-     llvm::MachineRegisterInfo &mri, const llvm::HexagonInstrInfo &tii,
-     llvm::MachineFunction &mf)
-  : MachineEvaluator(tri, mri), MF(mf), MFI(*mf.getFrameInfo()), TII(tii) {
+HexagonEvaluator::HexagonEvaluator(const HexagonRegisterInfo &tri,
+                                   MachineRegisterInfo &mri,
+                                   const HexagonInstrInfo &tii,
+                                   MachineFunction &mf)
+    : MachineEvaluator(tri, mri), MF(mf), MFI(*mf.getFrameInfo()), TII(tii) {
   // Populate the VRX map (VR to extension-type).
   // Go over all the formal parameters of the function. If a given parameter
   // P is sign- or zero-extended, locate the virtual register holding that