arch-gcn3: Fixup DIV instructions
arch-gcn3: Fixup DIV instructions

Adds support to handle the special cases
for GCN3 DIV instructions.

Change-Id: I18f91870e802407c93831f313ce76be053bc4230
Reviewed-on: https://gem5-review.googlesource.com/c/public/gem5/+/29956
Reviewed-by: Anthony Gutierrez <fe4627c83134668039628e34eb0e4dda45a5da5e@amd.com>
Reviewed-by: Matt Sinclair <d2406197fb1bedd1e23c70c50c510ff0e9ab0f5b@gmail.com>
Maintainer: Anthony Gutierrez <fe4627c83134668039628e34eb0e4dda45a5da5e@amd.com>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>

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