glsl/tests: take refs on glsl types

Much like each driver, tests as standalone entities must take
references on the glsl types.

Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Tapani Pälli <tapani.palli@intel.com>

src/compiler/glsl/tests/builtin_variable_test.cpp

@@ -57,6 +57,8 @@ public:
 void
 common_builtin::SetUp()
 {
+   glsl_type_singleton_init_or_ref();
+
    this->mem_ctx = ralloc_context(NULL);
    this->ir.make_empty();
 
@@ -79,6 +81,8 @@ common_builtin::TearDown()
 {
    ralloc_free(this->mem_ctx);
    this->mem_ctx = NULL;
+
+   glsl_type_singleton_decref();
 }
 
 void