Gracefully fail to set invalid breakpoints.
Track address spaces that are cloned for fork() children.
Fix this FileId constructor.
checkpoint
checkpoint
checkpoint; code written down
checkpoint; compiling
checkpoint; works up to syscallbuf usage
checkpoint; syscallbuf working
checkpoint; finished replay on deepfork
checkpoint; checkpoint-then-restart(checkpoint)-then-run-to-completion works
checkpoint; working with multiple threads
checkpoint; copy over blocked-sig-state
checkpoint; sundry bugfixes, mmap_shared almost working