Revert "Initial implementation of optimization bisect support."

This reverts commit r267022, due to an ASan failure:

  http://lab.llvm.org:8080/green/job/clang-stage2-cmake-RgSan_check/1549

llvm-svn: 267115
diff --git a/llvm/lib/Transforms/Scalar/JumpThreading.cpp b/llvm/lib/Transforms/Scalar/JumpThreading.cpp
index ba406a8..7495baa 100644
--- a/llvm/lib/Transforms/Scalar/JumpThreading.cpp
+++ b/llvm/lib/Transforms/Scalar/JumpThreading.cpp
@@ -187,7 +187,7 @@
 /// runOnFunction - Top level algorithm.
 ///
 bool JumpThreading::runOnFunction(Function &F) {
-  if (skipFunction(F))
+  if (skipOptnoneFunction(F))
     return false;
 
   DEBUG(dbgs() << "Jump threading on function '" << F.getName() << "'\n");