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

This reverts commit r213474 (and r213475), which causes a miscompile on
a stage2 LTO build.  I'll reply on the list in a moment.

llvm-svn: 213562

1 files changed, 5 insertions, 4 deletions

diff --git a/llvm/lib/Analysis/ScalarEvolution.cpp b/llvm/lib/Analysis/ScalarEvolution.cpp
index fd5b86b4634..06dbde58c10 100644
--- a/llvm/lib/Analysis/ScalarEvolution.cpp
+++ b/llvm/lib/Analysis/ScalarEvolution.cpp
@@ -4512,12 +4512,13 @@ ScalarEvolution::ComputeExitLimit(const Loop *L, BasicBlock *ExitingBlock) {
   // lead to the loop header.
   bool MustExecuteLoopHeader = true;
   BasicBlock *Exit = nullptr;
-  for (BasicBlock *Succ : successors(ExitingBlock))
-    if (!L->contains(Succ)) {
+  for (succ_iterator SI = succ_begin(ExitingBlock), SE = succ_end(ExitingBlock);
+       SI != SE; ++SI)
+    if (!L->contains(*SI)) {
       if (Exit) // Multiple exit successors.
         return getCouldNotCompute();
-      Exit = Succ;
-    } else if (Succ != L->getHeader()) {
+      Exit = *SI;
+    } else if (*SI != L->getHeader()) {
       MustExecuteLoopHeader = false;
     }