commit 188759bb documented the intent
to allow recursive dlopen based on tracking ctor_visitor, but used a
kernel tid rather than the pthread_t to identify the caller. as a
result, it would not behave as intended under fork by a ctor, where
the child tid would not match.

Test:libc-test/src/function/exit.c
Issue:I7F2LR
Signed-off-by: Nfangting <fangting12@huawei.com>