[llvm] [AArch64] Change the default vscale-for-tuning to 1. (PR #117174)

[David Sherwood via llvm-commits]

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david-arm wrote:

Could you add `-mcpu=neoverse-v1` to the RUN line here? When I wrote these tests I was wrongly assuming a default of vscale=2 and so a test like `low_vf_ic_is_better` is trying to show how the vectoriser deliberately doesn't choose the max possible.

https://github.com/llvm/llvm-project/pull/117174