Introduce analysis pass to compute PostDominators in the new pass manager. NFC

Differential Revision: http://reviews.llvm.org/D17537

llvm-svn: 261902
diff --git a/llvm/unittests/IR/DominatorTreeTest.cpp b/llvm/unittests/IR/DominatorTreeTest.cpp
index 3aef4d6..fcd6b9c 100644
--- a/llvm/unittests/IR/DominatorTreeTest.cpp
+++ b/llvm/unittests/IR/DominatorTreeTest.cpp
@@ -29,7 +29,8 @@
       bool runOnFunction(Function &F) override {
         DominatorTree *DT =
             &getAnalysis<DominatorTreeWrapperPass>().getDomTree();
-        PostDominatorTree *PDT = &getAnalysis<PostDominatorTree>();
+        PostDominatorTree *PDT =
+            &getAnalysis<PostDominatorTreeWrapperPass>().getPostDomTree();
         Function::iterator FI = F.begin();
 
         BasicBlock *BB0 = &*FI++;
@@ -206,7 +207,7 @@
       }
       void getAnalysisUsage(AnalysisUsage &AU) const override {
         AU.addRequired<DominatorTreeWrapperPass>();
-        AU.addRequired<PostDominatorTree>();
+        AU.addRequired<PostDominatorTreeWrapperPass>();
       }
       DPass() : FunctionPass(ID) {
         initializeDPassPass(*PassRegistry::getPassRegistry());
@@ -255,5 +256,5 @@
 
 INITIALIZE_PASS_BEGIN(DPass, "dpass", "dpass", false, false)
 INITIALIZE_PASS_DEPENDENCY(DominatorTreeWrapperPass)
-INITIALIZE_PASS_DEPENDENCY(PostDominatorTree)
+INITIALIZE_PASS_DEPENDENCY(PostDominatorTreeWrapperPass)
 INITIALIZE_PASS_END(DPass, "dpass", "dpass", false, false)