Reenabled introspection for llvm 3.6
Reenabled introspection for llvm 3.6

I'm an idiot. Was breaking because I was letting a unique_ptr
go out of scope and then trying to use the raw pointer.


Former-commit-id: 85989baf29cbb5b613a549bd5ef4f6b8511ecd8e
Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide,darkbuck/Halide,Trass3r/Halide,Trass3r/Halide,darkbuck/Halide,darkbuck/Halide,Trass3r/Halide