intel/compiler/test: Set devinfo->gen = 7

We emit an FBL instruction which only exists since Gen7. This prevents
the test from segfaulting when run with TEST_DEBUG=1.

Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>

src/intel/compiler/test_fs_cmod_propagation.cpp

@@ -65,7 +65,7 @@ void cmod_propagation_test::SetUp()
 
    v = new cmod_propagation_fs_visitor(compiler, prog_data, shader);
 
-   devinfo->gen = 4;
+   devinfo->gen = 7;
 }
 
 static fs_inst *