Revert r110396 to fix buildbots.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@110410 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/MachineLoopInfo.cpp b/lib/CodeGen/MachineLoopInfo.cpp
index 039edf2..269538b 100644
--- a/lib/CodeGen/MachineLoopInfo.cpp
+++ b/lib/CodeGen/MachineLoopInfo.cpp
@@ -33,7 +33,7 @@
 static RegisterPass<MachineLoopInfo>
 X("machine-loops", "Machine Natural Loop Construction", true);
 
-char &llvm::MachineLoopInfoID = MachineLoopInfo::ID;
+const PassInfo *const llvm::MachineLoopInfoID = &X;
 
 bool MachineLoopInfo::runOnMachineFunction(MachineFunction &) {
   releaseMemory();