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[AMDGPU] Remove MachineDCE after SIFoldOperands

Authored by foad on Apr 8 2021, 9:10 AM.

Description

[AMDGPU] Remove MachineDCE after SIFoldOperands

Remove the MachineDCE pass after the first SIFoldOperands pass now
that SIFoldOperands deletes its own dead instructions.

Differential Revision: https://reviews.llvm.org/D100189