[PATCH] D155708: [AArch64][NFC] Call the API getVScaleRange directly

[Allen zhong via Phabricator via llvm-commits]

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In D155708#4517477 <https://reviews.llvm.org/D155708#4517477>, @dmgreen wrote:

> I like the cleanup. getVScaleRange can fail, returning an empty range. Would this handle those cases too?

Use the maximum 64 for BitWidth of getVScaleRange to avoid returning an empty range.


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