[AMDGPU][MC] Add GFX12 VDS encoding (#75316)

Author: mbrkusanin

llvm/lib/Target/AMDGPU/DSInstructions.td

@@ -1983,3 +1983,9 @@ s_cmp_nlt_f16 s1, s2
 
 s_singleuse_vdst 0x1234
 // CHECK: :[[@LINE-1]]:{{[0-9]+}}: error: instruction not supported on this GPU
+
+ds_sub_clamp_rtn_u32 v5, v1, v2
+// CHECK: :[[@LINE-1]]:{{[0-9]+}}: error: instruction not supported on this GPU
+
+ds_sub_clamp_u32 v1, v2
+// CHECK: :[[@LINE-1]]:{{[0-9]+}}: error: instruction not supported on this GPU