freedreno/ir3: keep array stores

Since these are not in SSA form, add to block's keeps so it doesn't
appear unused.

Signed-off-by: Rob Clark <robdclark@gmail.com>

src/gallium/drivers/freedreno/ir3/ir3_compiler_nir.c

@@ -374,6 +374,12 @@ create_array_store(struct ir3_context *ctx, struct ir3_array *arr, int n,
 
 	arr->last_write = mov;
 
+	/* the array store may only matter to something in an earlier
+	 * block (ie. loops), but since arrays are not in SSA, depth
+	 * pass won't know this.. so keep all array stores:
+	 */
+	array_insert(block, block->keeps, mov);
+
 	return mov;
 }