amd/common: round cube array slice in ac_prepare_cube_coords

The NIR-to-LLVM pass already does this; now the same fix covers
radeonsi as well.

Fixes various tests of
dEQP-GLES31.functional.texture.filtering.cube_array.combinations.*

Cc: mesa-stable@lists.freedesktop.org
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Reviewed-by: Dave Airlie <airlied@redhat.com>

src/amd/common/ac_llvm_build.h

@@ -110,7 +110,7 @@ ac_build_fdiv(struct ac_llvm_context *ctx,
 
 void
 ac_prepare_cube_coords(struct ac_llvm_context *ctx,
-		       bool is_deriv, bool is_array,
+		       bool is_deriv, bool is_array, bool is_lod,
 		       LLVMValueRef *coords_arg,
 		       LLVMValueRef *derivs_arg);