blorp: Pass the batch to lookup/upload_shader instead of context

This will allow drivers to pin shader buffers if necessary.

i965 and anv do not need to do this today, but iris will.

Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>

src/intel/blorp/blorp.h

@@ -45,10 +45,10 @@ struct blorp_context {
 
    const struct brw_compiler *compiler;
 
-   bool (*lookup_shader)(struct blorp_context *blorp,
+   bool (*lookup_shader)(struct blorp_batch *batch,
                          const void *key, uint32_t key_size,
                          uint32_t *kernel_out, void *prog_data_out);
-   bool (*upload_shader)(struct blorp_context *blorp,
+   bool (*upload_shader)(struct blorp_batch *batch,
                          const void *key, uint32_t key_size,
                          const void *kernel, uint32_t kernel_size,
                          const struct brw_stage_prog_data *prog_data,