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/MachineBlockPlacement.cpp b/llvm/lib/CodeGen/MachineBlockPlacement.cpp
index af78d8a..6a9078a 100644
--- a/llvm/lib/CodeGen/MachineBlockPlacement.cpp
+++ b/llvm/lib/CodeGen/MachineBlockPlacement.cpp
@@ -1430,7 +1430,7 @@
   if (std::next(F.begin()) == F.end())
     return false;
 
-  if (skipOptnoneFunction(*F.getFunction()))
+  if (skipFunction(*F.getFunction()))
     return false;
 
   MBPI = &getAnalysis<MachineBranchProbabilityInfo>();