Reg2Mem is something a pass may depend on, so allow that

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24488 91177308-0d34-0410-b5e6-96231b3b80d8

include/llvm/Transforms/Scalar.h

@@ -168,6 +168,7 @@ FunctionPass *createPromoteMemoryToRegisterPass();
 // In basically undoes the PromoteMemoryToRegister pass to
 // make cfg hacking easier.
 FunctionPass *createDemoteRegisterToMemoryPass();
+extern const PassInfo *DemoteRegisterToMemoryID;
 
 //===----------------------------------------------------------------------===//
 //

lib/Transforms/Scalar/Reg2Mem.cpp

@@ -80,6 +80,7 @@ namespace {
 
 // createDemoteRegisterToMemory - Provide an entry point to create this pass.
 //
+const PassInfo *llvm::DemoteRegisterToMemoryID = X.getPassInfo();
 FunctionPass *llvm::createDemoteRegisterToMemoryPass() {
   return new RegToMem();
 }