[libFuzzer] split DataFlow.cpp into two .cpp files, one of which can be compiled w/o dfsan to speed things up (~25% speedup)

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@364002 91177308-0d34-0410-b5e6-96231b3b80d8
6 files changed