[C++11] Add predecessors(BasicBlock *) / successors(BasicBlock *) iterator ranges.

Summary: This patch introduces two new iterator ranges and updates existing code to use it.  No functional change intended.

Test Plan: All tests (make check-all) still pass.

Reviewers: dblaikie

Reviewed By: dblaikie

Subscribers: llvm-commits

Differential Revision: http://reviews.llvm.org/D4481

llvm-svn: 213474

1 files changed, 2 insertions, 3 deletions

diff --git a/llvm/lib/Transforms/Scalar/TailRecursionElimination.cpp b/llvm/lib/Transforms/Scalar/TailRecursionElimination.cpp
index 05b9892470b..d9280ac6c9c 100644
--- a/llvm/lib/Transforms/Scalar/TailRecursionElimination.cpp
+++ b/llvm/lib/Transforms/Scalar/TailRecursionElimination.cpp
@@ -335,7 +335,7 @@ bool TailCallElim::markTails(Function &F, bool &AllCallsAreTailCalls) {
       }
     }
 
-    for (auto *SuccBB : make_range(succ_begin(BB), succ_end(BB))) {
+    for (auto *SuccBB : successors(BB)) {
       auto &State = Visited[SuccBB];
       if (State < Escaped) {
         State = Escaped;
@@ -807,8 +807,7 @@ bool TailCallElim::FoldReturnAndProcessPred(BasicBlock *BB,
   // predecessors and perform TRC there. Look for predecessors that end
   // in unconditional branch and recursive call(s).
   SmallVector<BranchInst*, 8> UncondBranchPreds;
-  for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI) {
-    BasicBlock *Pred = *PI;
+  for (BasicBlock *Pred : predecessors(BB)) {
     TerminatorInst *PTI = Pred->getTerminator();
     if (BranchInst *BI = dyn_cast<BranchInst>(PTI))
       if (BI->isUnconditional())