Remove SlotIndex::PHI_BIT. It is no longer used by anything.

llvm-svn: 114779
diff --git a/llvm/lib/CodeGen/SlotIndexes.cpp b/llvm/lib/CodeGen/SlotIndexes.cpp
index 4d362d5..b106d3a 100644
--- a/llvm/lib/CodeGen/SlotIndexes.cpp
+++ b/llvm/lib/CodeGen/SlotIndexes.cpp
@@ -199,11 +199,7 @@
 
 // Print a SlotIndex to a raw_ostream.
 void SlotIndex::print(raw_ostream &os) const {
-  os << entry().getIndex();
-  if (isPHI())
-    os << "*";
-  else
-    os << "LudS"[getSlot()];
+  os << entry().getIndex() << "LudS"[getSlot()];
 }
 
 // Dump a SlotIndex to stderr.