Fix comment.

llvm-svn: 146226

llvm/lib/CodeGen/MachineSink.cpp

@@ -149,11 +149,10 @@ MachineSinking::AllUsesDominatedByBlock(unsigned Reg,
   assert(TargetRegisterInfo::isVirtualRegister(Reg) &&
          "Only makes sense for vregs");
 
+  // Ignore debug uses because debug info doesn't affect the code.
   if (MRI->use_nodbg_empty(Reg))
     return true;
 
-  // Ignoring debug uses because debug info doesn't affect the code.
-
   // BreakPHIEdge is true if all the uses are in the successor MBB being sunken
   // into and they are all PHI nodes. In this case, machine-sink must break
   // the critical edge first. e.g.