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[AMDGPU] Support mov dpp with 64 bit operands

Authored by rampitec on Oct 15 2019, 9:41 AM.

Description

[AMDGPU] Support mov dpp with 64 bit operands

We define mov/update dpp intrinsics as overloaded but do not
support i64, which is a practically useful type. Fix the
selection and lowering.

Differential Revision: https://reviews.llvm.org/D68673

llvm-svn: 374910

Details