feat: adding instrumentation for LLVM IR output

```BASH
> CT_DEBUG_AUTOFREE=1 ./coretrace-compiler/build/cc --instrument --ct-autofree \         
  -S -emit-llvm coretrace-compiler/test/ct_autofree_local.c -o /tmp/ct_autofree_local.ll
```
```BASH
> instrumentation only supports object/binary output%
```