[Bug tree-optimization/104547] std::vector::resize(v.size() - n) produces poor code

[redi at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104547

--- Comment #11 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This testcase now fails, because _M_default_append is not removed by vrp2. The
body of resize does get optimized pretty well by some later pass. But the
_M_default_append definition remains in the asm even though it's unused.