pcre2_jit_stack_free man page
PCRE2 — Perl-compatible regular expressions (revised API)
void pcre2_jit_stack_free(pcre2_jit_stack *jit_stack);
This function is used to free a JIT stack that was created by pcre2_jit_stack_create() when it is no longer needed. For more details, see the pcre2jit page.
There is a complete description of the PCRE2 native API in the pcre2api page and a description of the POSIX API in the pcre2posix page.