ASAN errors due to NFA changes

[samcv]

~/g/p/nqp ❯❯❯ nqp t/nqp/106-unicodenames.t
=================================================================
==18627==ERROR: AddressSanitizer: heap-buffer-overflow on address 0x618000005ba8 at pc 0x7f75180e985d bp 0x7ffe7a3e4d70 sp 0x7ffe7a3e4d68
READ of size 4 at 0x618000005ba8 thread T0
    #0 0x7f75180e985c in nqp_nfa_run (//home/samantha/perl6/lib/libmoar.so+0xa7485c)
    #1 0x7f75180e6743 in MVM_nfa_run_proto (//home/samantha/perl6/lib/libmoar.so+0xa71743)
    #2 0x7f7513d07e74  (<unknown module>)

0x618000005ba8 is located 16 bytes to the right of 792-byte region [0x618000005880,0x618000005b98)
allocated by thread T0 here:
    #0 0x4bcd23 in malloc /var/tmp/portage/sys-libs/compiler-rt-sanitizers-6.0.0/work/compiler-rt-6.0.0.src/lib/asan/asan_malloc_linux.cc:88:3
    #1 0x7f7518019025 in MVM_fixed_size_alloc (//home/samantha/perl6/lib/libmoar.so+0x9a4025)
    #2 0x7f75180e6416 in sort_states_and_add_synth_cp_node (//home/samantha/perl6/lib/libmoar.so+0xa71416)
    #3 0x7f75180e5e0a in MVM_nfa_from_statelist (//home/samantha/perl6/lib/libmoar.so+0xa70e0a)
    #4 0x7f7517faa206 in MVM_interp_run (//home/samantha/perl6/lib/libmoar.so+0x935206)
    #5 0x7f751827a586 in MVM_vm_run_file (//home/samantha/perl6/lib/libmoar.so+0xc05586)
    #6 0x4eaff1 in main (/home/samantha/perl6/bin/moar+0x4eaff1)
    #7 0x7f751656c64c in __libc_start_main (/lib64/libc.so.6+0x2064c)

SUMMARY: AddressSanitizer: heap-buffer-overflow (//home/samantha/perl6/lib/libmoar.so+0xa7485c) in nqp_nfa_run
Shadow bytes around the buggy address:
  0x0c307fff8b20: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c307fff8b30: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c307fff8b40: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c307fff8b50: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
  0x0c307fff8b60: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
=>0x0c307fff8b70: 00 00 00 fa fa[fa]fa fa fa fa fa fa fa fa fa fa
  0x0c307fff8b80: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa
  0x0c307fff8b90: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c307fff8ba0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c307fff8bb0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
  0x0c307fff8bc0: fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd fd
Shadow byte legend (one shadow byte represents 8 application bytes):
  Addressable:           00
  Partially addressable: 01 02 03 04 05 06 07 
  Heap left redzone:       fa
  Freed heap region:       fd
  Stack left redzone:      f1
  Stack mid redzone:       f2
  Stack right redzone:     f3
  Stack after return:      f5
  Stack use after scope:   f8
  Global redzone:          f9
  Global init order:       f6
  Poisoned by user:        f7
  Container overflow:      fc
  Array cookie:            ac
  Intra object redzone:    bb
  ASan internal:           fe
  Left alloca redzone:     ca
  Right alloca redzone:    cb
==18627==ABORTING

[lizmat]

I feel this is related: https://gist.github.com/lizmat/f7ce01f608c0ef8ab7d560ce2b4286ae