Add an instruction about stacktrace on x86-64 in INSTALL file. Basically, this
-rw-r--r-- 23 AUTHORS
-rw-r--r-- 1479 COPYING
-rw-r--r-- 504 ChangeLog
-rw-r--r-- 12193 INSTALL
-rw-r--r-- 7703 Makefile.am
-rw-r--r-- 73815 Makefile.in
-rw-r--r-- 0 NEWS
-rw-r--r-- 237 README
-rw-r--r-- 271049 aclocal.m4
-rwxr-xr-x 719 autogen.sh
-rwxr-xr-x 2774 compile
-rwxr-xr-x 44593 config.guess
-rwxr-xr-x 32724 config.sub
-rwxr-xr-x 799338 configure
-rw-r--r-- 7120 configure.ac
-rwxr-xr-x 17867 depcomp
drwxr-xr-x - doc
-rwxr-xr-x 13620 install-sh
-rw-r--r-- 199991 ltmain.sh
drwxr-xr-x - m4
-rwxr-xr-x 11135 missing
-rwxr-xr-x 3495 mkinstalldirs
drwxr-xr-x - packages
drwxr-xr-x - src