isl/tests: Add some tests for intratile offsets
isl/tests: Add some tests for intratile offsets

Test isl_surf_get_image_intratile_offset_el() in the tests:
  test_bdw_2d_r8g8b8a8_unorm_512x512_array01_samples01_noaux_tiley0
  test_bdw_2d_r8g8b8a8_unorm_1024x1024_array06_samples01_noaux_tiley0

metora/MesaGLSLCompiler,metora/MesaGLSLCompiler,metora/MesaGLSLCompiler