anv: Add support for the PMA fix on Broadwell

This helps Dota 2 on Broadwell by 8-9%.  I also hacked up the driver and
used the Sascha "shadowmapping" demo to get some results.  Setting
uses_kill to true dropped the framerate on the demo by 25-30%.  Enabling
the PMA fix brought it back up to around 90% of the original framerate.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Nanley Chery <nanley.g.chery@intel.com>

src/intel/vulkan/anv_cmd_buffer.c

@@ -135,6 +135,8 @@ anv_cmd_state_reset(struct anv_cmd_buffer *cmd_buffer)
    state->restart_index = UINT32_MAX;
    state->dynamic = default_dynamic_state;
    state->need_query_wa = true;
+   state->pma_fix_enabled = false;
+   state->hiz_enabled = false;
 
    if (state->attachments != NULL) {
       vk_free(&cmd_buffer->pool->alloc, state->attachments);