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/Reassociate.cpp b/llvm/lib/Transforms/Scalar/Reassociate.cpp
index 5e9a0b5..b22e2cd 100644
--- a/llvm/lib/Transforms/Scalar/Reassociate.cpp
+++ b/llvm/lib/Transforms/Scalar/Reassociate.cpp
@@ -2257,7 +2257,7 @@
 }
 
 bool Reassociate::runOnFunction(Function &F) {
-  if (skipFunction(F))
+  if (skipOptnoneFunction(F))
     return false;
 
   // Reassociate needs for each instruction to have its operands already