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!

llvm-svn: 215111

llvm/examples/Fibonacci/fibonacci.cpp

@@ -26,7 +26,6 @@
 #include "llvm/IR/Verifier.h"
 #include "llvm/ExecutionEngine/GenericValue.h"
 #include "llvm/ExecutionEngine/Interpreter.h"
-#include "llvm/ExecutionEngine/JIT.h"
 #include "llvm/IR/Constants.h"
 #include "llvm/IR/DerivedTypes.h"
 #include "llvm/IR/Instructions.h"