Don't print register names in LiveIntervalUnion::print().

Soon we'll be making LiveIntervalUnions for register units as well.

This was the only place using the RepReg member, so just remove it.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@158038 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/RegAllocBase.cpp b/lib/CodeGen/RegAllocBase.cpp
index 3c91330..5b2ec5e 100644
--- a/lib/CodeGen/RegAllocBase.cpp
+++ b/lib/CodeGen/RegAllocBase.cpp
@@ -96,7 +96,7 @@
   Array =
     static_cast<LiveIntervalUnion*>(malloc(sizeof(LiveIntervalUnion)*NRegs));
   for (unsigned r = 0; r != NRegs; ++r)
-    new(Array + r) LiveIntervalUnion(r, allocator);
+    new(Array + r) LiveIntervalUnion(allocator);
 }
 
 void RegAllocBase::init(VirtRegMap &vrm, LiveIntervals &lis) {