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
diff --git a/llvm/lib/Transforms/IPO/LoopExtractor.cpp b/llvm/lib/Transforms/IPO/LoopExtractor.cpp
index 3f973c7..20414aa 100644
--- a/llvm/lib/Transforms/IPO/LoopExtractor.cpp
+++ b/llvm/lib/Transforms/IPO/LoopExtractor.cpp
@@ -229,7 +229,9 @@
     // Look through the landing pad's predecessors. If one of them ends in an
     // 'invoke', then we want to split the landing pad.
     bool Split = false;
-    for (BasicBlock *BB : predecessors(LPad)) {
+    for (pred_iterator
+           PI = pred_begin(LPad), PE = pred_end(LPad); PI != PE; ++PI) {
+      BasicBlock *BB = *PI;
       if (BB->isLandingPad() && BB != Parent &&
           isa<InvokeInst>(Parent->getTerminator())) {
         Split = true;