Nuke the old JIT.

I am sure we will be finding bits and pieces of dead code for years to
come, but this is a good start.

Thanks to Lang Hames for making MCJIT a good replacement!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215111 91177308-0d34-0410-b5e6-96231b3b80d8

examples/Kaleidoscope/Chapter4/CMakeLists.txt

@@ -3,7 +3,6 @@ set(LLVM_LINK_COMPONENTS
   Core
   ExecutionEngine
   InstCombine
-  JIT
   MC
   ScalarOpts
   Support

examples/Kaleidoscope/Chapter4/toy.cpp

@@ -1,6 +1,5 @@
 #include "llvm/Analysis/Passes.h"
 #include "llvm/ExecutionEngine/ExecutionEngine.h"
-#include "llvm/ExecutionEngine/JIT.h"
 #include "llvm/IR/DataLayout.h"
 #include "llvm/IR/DerivedTypes.h"
 #include "llvm/IR/IRBuilder.h"