anv: Improve BTI change cache flushing

This commit makes two changes:

 1. We set pending_pipe_bits instead of emitting PIPE_CONTROL directly
    for the flush at the end of cmd_buffer_begin_subpass.

 2. Because BLORP ops such as vkCmdClearAttachments may come in the
    middle of a render pass, we have to also flag the need for a cache
    flush after the blorp op.

Fixes: 185630c6bc "anv/blorp: Do the gen11 BTI flush"
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/merge_requests/3547>
(cherry picked from commit c70a786c77)

Conflicts:
	src/intel/vulkan/genX_cmd_buffer.c

.pick_status.json

@@ -1624,7 +1624,7 @@
         "description": "anv: Improve BTI change cache flushing",
         "nominated": true,
         "nomination_type": 1,
-        "resolution": 0,
+        "resolution": 1,
         "master_sha": null,
         "because_sha": "185630c6bc973e9a2fec6172325bf31d70bc2eec"
     },

src/intel/vulkan/genX_blorp_exec.c

@@ -268,6 +268,20 @@ genX(blorp_exec)(struct blorp_batch *batch,
 
    blorp_exec(batch, params);
 
+#if GEN_GEN >= 11
+   /* The PIPE_CONTROL command description says:
+    *
+    *    "Whenever a Binding Table Index (BTI) used by a Render Taget Message
+    *     points to a different RENDER_SURFACE_STATE, SW must issue a Render
+    *     Target Cache Flush by enabling this bit. When render target flush
+    *     is set due to new association of BTI, PS Scoreboard Stall bit must
+    *     be set in this packet."
+    */
+   cmd_buffer->state.pending_pipe_bits |=
+      ANV_PIPE_RENDER_TARGET_CACHE_FLUSH_BIT |
+      ANV_PIPE_STALL_AT_SCOREBOARD_BIT;
+#endif
+
    cmd_buffer->state.gfx.vb_dirty = ~0;
    cmd_buffer->state.gfx.dirty = ~0;
    cmd_buffer->state.push_constants_dirty = ~0;

src/intel/vulkan/genX_cmd_buffer.c

@@ -4548,6 +4548,20 @@ cmd_buffer_begin_subpass(struct anv_cmd_buffer *cmd_buffer,
    }
 
    cmd_buffer_emit_depth_stencil(cmd_buffer);
+
+#if GEN_GEN >= 11
+   /* The PIPE_CONTROL command description says:
+    *
+    *    "Whenever a Binding Table Index (BTI) used by a Render Taget Message
+    *     points to a different RENDER_SURFACE_STATE, SW must issue a Render
+    *     Target Cache Flush by enabling this bit. When render target flush
+    *     is set due to new association of BTI, PS Scoreboard Stall bit must
+    *     be set in this packet."
+    */
+   cmd_buffer->state.pending_pipe_bits |=
+      ANV_PIPE_RENDER_TARGET_CACHE_FLUSH_BIT |
+      ANV_PIPE_STALL_AT_SCOREBOARD_BIT;
+#endif
 }
 
 static enum blorp_filter