[Bug tree-optimization/83202] Try joining operations on consecutive array elements during tree vectorization

[rguenth at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83202
Bug 83202 depends on bug 83326, which changed state.

Bug 83326 Summary: [8 Regression] SPEC CPU2017 648.exchange2_s ~6% performance 
regression with r255267 (reproducer attached)
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83326

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