Check for unresolved calls in LCAA
Add basic support for the stat syscall, and remove arbitrary loop length limit
Mark isatty as a pseudo-syscall and define it for files under our control.

This is a time saver; isatty is userspace code and this should be reformulated as a side-effect of ioctl with TCGETS
Add support for forwarding constant integers in the guise of pointers (e.g. (char*)-1 comes up quite a lot)

Also add a flag to skip DIE for faster testing
Add realloc support, including a simple test.

I hopefully tag realloc as returning a noalias result, and conceive of it as alloc; memcpy; free (and therefore happily say 'noalias' between the malloc and the realloc, since they are never concurrently live)