intel/tools/error: Save error state sections and decode them later.

intel/tools/error: Save error state sections and decode them later.

This lets us complete parsing and storing of each buffer's data before
we begin decoding the batchbuffer.  This makes it possible to inspect
the state buffer and program buffer, so we can properly decode any
indirect state or shader programs.

Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>