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/HexagonISelLowering.cpp b/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp
index 5a6721b..eb6839c 100644
--- a/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp
+++ b/llvm/lib/Target/Hexagon/HexagonISelLowering.cpp
@@ -1067,7 +1067,7 @@
     A = HFI.getStackAlignment();
 
   DEBUG({
-    dbgs () << LLVM_FUNCTION_NAME << " Align: " << A << " Size: ";
+    dbgs () << __func__ << " Align: " << A << " Size: ";
     Size.getNode()->dump(&DAG);
     dbgs() << "\n";
   });