blorp: Add a blorp_address::local_hint flag

This will be used as a performance hint for XY_BLOCK_COPY_BLT to
indicate whether the source/destination surfaces are (likely) in
device-local memory or system memory.  We don't need to be precise
here - it's okay to set the fields to LOCAL even if a buffer has
been evicted out to system memory.

We should set this from Vulkan too, but I haven't yet.  There isn't
a convenient anv_bo field like there is in iris...

Reviewed-by: Caio Oliveira <caio.oliveira@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14687>

src/gallium/drivers/iris/iris_blorp.c

@@ -195,6 +195,7 @@ blorp_alloc_vertex_buffer(struct blorp_batch *blorp_batch,
       .offset = offset,
       .mocs = iris_mocs(bo, &batch->screen->isl_dev,
                         ISL_SURF_USAGE_VERTEX_BUFFER_BIT),
+      .local_hint = iris_bo_likely_local(bo),
    };
 
    return map;
@@ -242,6 +243,8 @@ blorp_get_workaround_address(struct blorp_batch *blorp_batch)
    return (struct blorp_address) {
       .buffer = batch->screen->workaround_address.bo,
       .offset = batch->screen->workaround_address.offset,
+      .local_hint =
+         iris_bo_likely_local(batch->screen->workaround_address.bo),
    };
 }