[Bug rtl-optimization/118502] Add shrink wrapping testcase for vector::push_back

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118502

Sam James <sjames at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |sjames at gcc dot gnu.org

--- Comment #5 from Sam James <sjames at gcc dot gnu.org> ---
I was going to ask how H.J. missed the regression as I was convinced we'd
committed this :)