the basis of base addresses comparison.

* addr2line.c: use uintptr_t instead of intptr_t for poinrters.

* addr2line.c (rb_dump_backtrace_with_lines): don't use syms.

* vm_dump.c (rb_print_backtrace): ditto.

* addr2line.h: ditto.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@45425 b2dd03c8-39d4-4d8f-98ff-823fe69b080e