Paul Walker 62d11b2cca Revert "Revert "[SCEV] Add SCEVType to represent vscale.""
Relanding after fixing Polly related build error.

This reverts commit 7b26dcae9eaf8cdcba7fef032fd83d060dffd4b4.
2023-03-02 13:14:07 +00:00
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