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[RISCV] Add intrinsics for vcompress instruction

Authored by arcbbb on Dec 24 2020, 6:56 PM.

Description

[RISCV] Add intrinsics for vcompress instruction

This patch defines vcompress intrinsics and lower to V instructions.

We work with @rogfer01 from BSC to come out this patch.

Authored-by: Roger Ferrer Ibanez <rofirrim@gmail.com>
Co-Authored-by: ShihPo Hung <shihpo.hung@sifive.com>

Differential revision: https://reviews.llvm.org/D93809

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