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[RISCV][Clang] Add RVV Widening Integer Add/Subtract intrinsic functions.

Authored by khchen on Tue, Apr 6, 3:26 AM.

Description

[RISCV][Clang] Add RVV Widening Integer Add/Subtract intrinsic functions.

Reviewed By: craig.topper

Authored-by: Roger Ferrer Ibanez <rofirrim@gmail.com>
Co-Authored-by: Zakk Chen <zakk.chen@sifive.com>

Differential Revision: https://reviews.llvm.org/D99526