[NFC][AMDGPU] don't test asyncmark for non-async variants on pre-gfx12 (#190774) The test for asyncmark on pref-gfx12 targets, checks the effect of async marks on both async and non-async instructions. This is achieved by a sed invocation in the RUN line to remove the .async from intrinsic name. Such a test serves no purpose other than a minor flex. The two sets of CHECK lines using the WITH and WITHOUT prefix are not easy to compare by a simple eyeballing. Eliminating this hack makes it easier to add GISEL variants later. With and without GISEL, the combinations will increase to four instead of the current two. Assisted-By: Claude Opus 4.6
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