[Bug tree-optimization/91532] [SVE] Redundant predicated store in gcc.target/aarch64/fmla_2.c

[rsandifo at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91532

--- Comment #3 from rsandifo at gcc dot gnu.org <rsandifo at gcc dot gnu.org> 
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I think it'd be good to add a testcase for this, assuming that
it's now fixed.