[llvm] [AMDGPU] Add intrinsics and MIs for ds_bvh_stack_* (PR #130007)

[Jay Foad via llvm-commits]

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@@ -1268,6 +1279,11 @@ defm DS_PK_ADD_BF16       : DS_Real_gfx12<0x09b>;
 defm DS_PK_ADD_RTN_BF16   : DS_Real_gfx12<0x0ab>;
 defm DS_BPERMUTE_FI_B32   : DS_Real_gfx12<0x0cd>;
 
+defm DS_BVH_STACK_RTN_B32             : DS_Real_gfx12<0x0e0,
+  "ds_bvh_stack_push4_pop1_rtn_b32", true>;
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jayfoad wrote:

This adds `ds_bvh_stack_rtn_b32` as an alias for `ds_bvh_stack_push4_pop1_rtn_b32`, right? There should be a test for that if there isn't one already, probably in `gfx12_asm_ds_alias.s`.

https://github.com/llvm/llvm-project/pull/130007