gitlab-ci: set RADV_DEBUG=checkir for RADV test jobs

This is used to validate if the driver emits correct LLVM IR.

Signed-off-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>

.gitlab-ci.yml

@@ -636,6 +636,7 @@ arm64_a306_gles2:
 .test-radv:
   variables:
     VK_DRIVER: radeon
+    RADV_DEBUG: checkir
   # Can only be triggered manually on personal branches because RADV is the only
   # driver that does Vulkan testing at the moment.
   rules: