Use __func__ directly now that all supported compilers support it

Remove the portability macro now that it is unused.

llvm-svn: 284681
diff --git a/llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp b/llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp
index 88a9e26..f670504 100644
--- a/llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonFrameLowering.cpp
@@ -1315,7 +1315,7 @@
 
 bool HexagonFrameLowering::assignCalleeSavedSpillSlots(MachineFunction &MF,
       const TargetRegisterInfo *TRI, std::vector<CalleeSavedInfo> &CSI) const {
-  DEBUG(dbgs() << LLVM_FUNCTION_NAME << " on "
+  DEBUG(dbgs() << __func__ << " on "
                << MF.getFunction()->getName() << '\n');
   MachineFrameInfo &MFI = MF.getFrameInfo();
   BitVector SRegs(Hexagon::NUM_TARGET_REGS);