Index: lib/CodeGen/RegisterCoalescer.cpp
===================================================================
--- lib/CodeGen/RegisterCoalescer.cpp
+++ lib/CodeGen/RegisterCoalescer.cpp
@@ -2782,7 +2782,8 @@
     if (V.Resolution != CR_Unresolved)
       continue;
     LLVM_DEBUG(dbgs() << "\t\tconflict at " << printReg(Reg) << ':' << i << '@'
-                      << LR.getValNumInfo(i)->def << '\n');
+                      << LR.getValNumInfo(i)->def
+                      << ' ' << PrintLaneMask(LaneMask) << '\n');
     if (SubRangeJoin)
       return false;