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[TTI] NFC: Change getShuffleCost to return InstructionCost

Authored by sdesmalen on Apr 14 2021, 8:50 AM.

Description

[TTI] NFC: Change getShuffleCost to return InstructionCost

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

Reviewed By: dmgreen

Differential Revision: https://reviews.llvm.org/D100314

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