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[NFC][CostModel]Extend class IntrinsicCostAttributes to use ElementCount Type

Authored by CarolineConcatto on Nov 16 2020, 2:14 AM.

Description

[NFC][CostModel]Extend class IntrinsicCostAttributes to use ElementCount Type

This patch replaces the attribute unsigned VF in the class
IntrinsicCostAttributes by ElementCount VF.
This is a non-functional change to help upcoming patches to compute the cost
model for scalable vector inside this class.

Differential Revision: https://reviews.llvm.org/D91532