Refs Tokutek/ft-index#28 attach gdb to the running process and extract information on fatal signal (port to mariadb)
(cherry picked from commit 9941601b2a1bbcd126ae61b5bf83d33fb6852cf0)
refs Tokutek/ft-index#28 fix help file result test
(cherry picked from commit 0b28c0d8fcdb9c98d43236dedbcc2d80fc717b24)