[Bug middle-end/109849] suboptimal code for vector walking loop

[hubicka at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109849
Bug 109849 depends on bug 110287, which changed state.

Bug 110287 Summary: _M_check_len is expensive
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110287

           What    |Removed                     |Added
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             Status|NEW                         |RESOLVED
         Resolution|---                         |FIXED