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[TTI] NFC: Change getArithmeticReductionCost to return InstructionCost
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Authored by sdesmalen on Fri, Apr 9, 8:07 AM.

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Summary

This patch migrates the TTI cost interfaces to return an InstructionCost.

See this patch for the introduction of the type: https://reviews.llvm.org/D91174
See this thread for context: http://lists.llvm.org/pipermail/llvm-dev/2020-November/146408.html

This patch is practically NFC, with the exception of an AArch64 SVE related
cost-model change, where we can now return an Invalid cost instead of some
bogus number.

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