[LV][VPlan] Reduce register usage of VPEVLBasedIVPHIRecipe. (#154482) `VPEVLBasedIVPHIRecipe` will lower to VPInstruction scalar phi and generate scalar phi. This recipe will only occupy a scalar register just like other phi recipes. This patch fix the register usage for `VPEVLBasedIVPHIRecipe` from vector to scalar which is close to generated vector IR. https://godbolt.org/z/6Mzd6W6ha shows that no register spills when choosing `<vscale x 16>`. Note that this test is basically copied from AArch64.
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