v3d: add new flag dirty TMU cache at v3d_compiler

That we set for any TMU write on spills and general tmu. It is then
used as part of v3d_emit_gl_shader_state later.

v2: add a new flag instead at v3d_compiler instead of dirty the flag
    at v3dx if there is any spill (change suggested by Eric, added by
    Alejandro)

v3: set this for anything that is not a load and do it also in
    v3d40_vir_emit_image_load_store (Eric)

Reviewed-by: Eric Anholt <eric@anholt.net>

src/broadcom/compiler/v3d40_tex.c

@@ -410,4 +410,7 @@ v3d40_vir_emit_image_load_store(struct v3d_compile *c,
 
         if (nir_intrinsic_dest_components(instr) == 0)
                 vir_TMUWT(c);
+
+        if (instr->intrinsic != nir_intrinsic_image_deref_load)
+                c->tmu_dirty_rcl = true;
 }