xdl_sym(handle, XU_LIBBACKTRACE_CREATE, NULL) fail when xDL upgrade from 1.1.1 to 1.1.2

[lianhansheng]

File: xu_libbacktrace.c
Fail code: if(NULL == (xu_libbacktrace_create_ptr = (xu_libbacktrace_create_t)xdl_sym(handle, XU_LIBBACKTRACE_CREATE, NULL))) goto end;

Device info: vivo Y51A
System: Funtouch OS
Andorid: 5.1.1

libbacktrace_libc++.so.zip