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tree-vectorize instead of tree-loop-vectorize should allow also for SLP.

Christos Anastopoulos requested to merge ATLAS-EGamma/athena:tree_vectorize into master

Change tree-loop-vectorise to tree-vectorize this should allow for so called SLP vectorization i.e includes tree-loop-vectorise and tree-slp-vectorize

An example taken from https://gcc.gnu.org/projects/tree-ssa/vectorization.html#slp can be seen (this is with gcc9 ...)

"https://godbolt.org/z/f7vA9k" vs "https://godbolt.org/z/6Zz7Z_"

to give an idea for potential differences ....

Mentioning @ssnyder

Edited by Christos Anastopoulos

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