anv: narrow flushing of the render target to buffer writes

In commit 9a7b319903 ("anv/query: flush render target before
copying results") we tracked all the render target writes to apply a
flushes in the vkCopyQueryResults(). But we can narrow this down to
only when we write a buffer (which is the only input of
vkCopyQueryResults).

v2: Drop newer render target write flags introduce by 1952fd8d2c
    ("anv: Implement VK_EXT_conditional_rendering for gen 7.5+")

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net> (v1)

src/intel/vulkan/genX_query.c

@@ -733,7 +733,7 @@ void genX(CmdCopyQueryPoolResults)(
     * to ensure proper ordering of the commands from the 3d pipe and the
     * command streamer.
     */
-   if (cmd_buffer->state.pending_pipe_bits & ANV_PIPE_RENDER_TARGET_WRITES) {
+   if (cmd_buffer->state.pending_pipe_bits & ANV_PIPE_RENDER_TARGET_BUFFER_WRITES) {
       cmd_buffer->state.pending_pipe_bits |=
          ANV_PIPE_RENDER_TARGET_CACHE_FLUSH_BIT;
    }