Recommit "[GlobalOpt] Pass DTU to removeUnreachableBlocks instead of recomputing."

The cause for the revert should be fixed by r373513 /
a80b6c1

This reverts commit 47dbcbd.

llvm-svn: 373522

Author: fhahn

llvm/lib/Transforms/IPO/GlobalOpt.cpp

@@ -2285,14 +2285,10 @@ OptimizeFunctions(Module &M,
     // So, remove unreachable blocks from the function, because a) there's
     // no point in analyzing them and b) GlobalOpt should otherwise grow
     // some more complicated logic to break these cycles.
-    // Removing unreachable blocks might invalidate the dominator so we
-    // recalculate it.
     if (!F->isDeclaration()) {
-      if (removeUnreachableBlocks(*F)) {
-        auto &DT = LookupDomTree(*F);
-        DT.recalculate(*F);
-        Changed = true;
-      }
+      auto &DT = LookupDomTree(*F);
+      DomTreeUpdater DTU(DT, DomTreeUpdater::UpdateStrategy::Lazy);
+      Changed |= removeUnreachableBlocks(*F, &DTU);
     }
 
     Changed |= processGlobal(*F, GetTLI, LookupDomTree);