Re-commit optimization bisect support (r267022) without new pass manager support.

The original commit was reverted because of a buildbot problem with LazyCallGraph::SCC handling (not related to the OptBisect handling).

Differential Revision: http://reviews.llvm.org/D19172

llvm-svn: 267231
diff --git a/llvm/lib/CodeGen/BranchFolding.cpp b/llvm/lib/CodeGen/BranchFolding.cpp
index 065bac0..d0b2304 100644
--- a/llvm/lib/CodeGen/BranchFolding.cpp
+++ b/llvm/lib/CodeGen/BranchFolding.cpp
@@ -90,7 +90,7 @@
                 "Control Flow Optimizer", false, false)
 
 bool BranchFolderPass::runOnMachineFunction(MachineFunction &MF) {
-  if (skipOptnoneFunction(*MF.getFunction()))
+  if (skipFunction(*MF.getFunction()))
     return false;
 
   TargetPassConfig *PassConfig = &getAnalysis<TargetPassConfig>();