Comment 2 for bug 1717367

In perl 5.26.0-5:

(gdb) print PL_sig_name
$2 = {0x2fdbfe "ZERO", 0x2fdc03 "HUP", 0x291cb1 "INT", 0x2fdc07 "QUIT",
  0x2fdc1f "ILL", 0x2fdc0c "TRAP", 0x2fdc11 "ABRT", 0x2fdc16 "BUS",
  0x2fdc1a "FPE", 0x2fdc1e "KILL", 0x2fdc23 "USR1", 0x2fdc28 "SEGV",
  0x2fdc2d "USR2", 0x2fdc32 "PIPE", 0x2fdc62 "ALRM", 0x294ac5 "TERM",
  0x2fdc37 "STKFLT", 0x2ba573 "CHLD", 0x2fdc3e "CONT", 0x2b81b8 "STOP",
  0x2fdc43 "TSTP", 0x2fdc48 "TTIN", 0x2fdc4d "TTOU", 0x2fdc52 "URG",
  0x2fdc56 "XCPU", 0x2fdc5b "XFSZ", 0x2fdc60 "VTALRM", 0x2fdc67 "PROF",
  0x2fdc6c "WINCH", 0x2fdef1 "IO", 0x2fdc72 "PWR", 0x2fdc76 "SYS",
  0x2fdc7a "NUM32", 0x2fdc80 "NUM33", 0x2fdc86 "RTMIN", 0x2fdc8c "NUM35",
  0x2fdc92 "NUM36", 0x2fdc98 "NUM37", 0x2fdc9e "NUM38", 0x2fdca4 "NUM39",
  0x2fdcaa "NUM40", 0x2fdcb0 "NUM41", 0x2fdcb6 "NUM42", 0x2fdcbc "NUM43",
  0x2fdcc2 "NUM44", 0x2fdcc8 "NUM45", 0x2fdcce "NUM46", 0x2fdcd4 "NUM47",
  0x2fdcda "NUM48", 0x2fdce0 "NUM49", 0x2fdce6 "NUM50", 0x2fdcec "NUM51",
  0x2fdcf2 "NUM52", 0x2fdcf8 "NUM53", 0x2fdcfe "NUM54", 0x2fdd04 "NUM55",
  0x2fdd0a "NUM56", 0x2fdd10 "NUM57", 0x2fdd16 "NUM58", 0x2fdd1c "NUM59",
  0x2fdd22 "NUM60", 0x2fdd28 "NUM61", 0x2fdd2e "NUM62", 0x2fdd34 "NUM63",
  0x2fdd3a "RTMAX", 0x2fdd40 "IOT", 0x2ba578 "CLD", 0x2fdd44 "POLL",
  0x2fdd49 "UNUSED", 0x0}
(gdb) quit

In perl 5.26.0-7:

(gdb) print PL_sig_name
$6 = {0x55555585d37e "ZERO", 0x55555585d383 "HUP", 0x5555557e6da8 "INT",
  0x55555585d387 "QUIT", 0x55555585d39f "ILL", 0x55555585d38c "TRAP",
  0x55555585d391 "ABRT", 0x55555585d396 "BUS", 0x55555585d39a "FPE",
  0x55555585d39e "KILL", 0x55555585d3a3 "USR1", 0x55555585d3a8 "SEGV",
  0x55555585d3ad "USR2", 0x55555585d3b2 "PIPE", 0x55555585d3e7 "ALRM",
  0x5555557eb48a "TERM", 0x55555585d3b7 "STKFLT", 0x55555585d3be "CHLD",
  0x55555585d3c3 "CONT", 0x555555813492 "STOP", 0x55555585d3c8 "TSTP",
  0x55555585d3cd "TTIN", 0x55555585d3d2 "TTOU", 0x55555585d3d7 "URG",
  0x55555585d3db "XCPU", 0x55555585d3e0 "XFSZ", 0x55555585d3e5 "VTALRM",
  0x55555585d3ec "PROF", 0x55555585d3f1 "WINCH", 0x55555585d671 "IO",
  0x55555585d3f7 "PWR", 0x55555585d3fb "SYS", 0x55555585d3ff "NUM32",
  0x55555585d405 "NUM33", 0x55555585d40b "RTMIN", 0x55555585d411 "NUM35",
  0x55555585d417 "NUM36", 0x55555585d41d "NUM37", 0x55555585d423 "NUM38",
  0x55555585d429 "NUM39", 0x55555585d42f "NUM40", 0x55555585d435 "NUM41",
  0x55555585d43b "NUM42", 0x55555585d441 "NUM43", 0x55555585d447 "NUM44",
  0x55555585d44d "NUM45", 0x55555585d453 "NUM46", 0x55555585d459 "NUM47",
  0x55555585d45f "NUM48", 0x55555585d465 "NUM49", 0x55555585d46b "NUM50",
  0x55555585d471 "NUM51", 0x55555585d477 "NUM52", 0x55555585d47d "NUM53",
  0x55555585d483 "NUM54", 0x55555585d489 "NUM55", 0x55555585d48f "NUM56",
  0x55555585d495 "NUM57", 0x55555585d49b "NUM58", 0x55555585d4a1 "NUM59",
  0x55555585d4a7 "NUM60", 0x55555585d4ad "NUM61", 0x55555585d4b3 "NUM62",
  0x55555585d4b9 "NUM63", 0x55555585d4bf "RTMAX", 0x55555585d4c5 "IOT",
  0x5555558158a0 "CLD", 0x55555585d4c9 "POLL", 0x0}
(gdb)

I don't know why the table got one shorter, but since this wasn't a sourceful change in perl, I suspect it was a change induced by glibc 2.26.