[PHIElimination] Use the same name for DEBUG_TYPE and pass name.

In an attempt to reduce the confusion.

llvm-svn: 302742
diff --git a/llvm/lib/CodeGen/PHIElimination.cpp b/llvm/lib/CodeGen/PHIElimination.cpp
index c67a25b..db2264b 100644
--- a/llvm/lib/CodeGen/PHIElimination.cpp
+++ b/llvm/lib/CodeGen/PHIElimination.cpp
@@ -34,7 +34,7 @@
 #include <algorithm>
 using namespace llvm;
 
-#define DEBUG_TYPE "phielim"
+#define DEBUG_TYPE "phi-node-elimination"
 
 static cl::opt<bool>
 DisableEdgeSplitting("disable-phi-elim-edge-splitting", cl::init(false),