eopXD b089e4072a [RISCV] Don't allow i64 vector div by constant to use mulh with Zve64x ...

EEW=64 of mulh and its vairants requires V extension.

Authored by: Craig Topper <craig.topper@sifive.com> @craig.topper

Reviewed By: craig.topper

Differential Revision: https://reviews.llvm.org/D117947

2022-01-25 09:55:05 -08:00

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