glsl: Add basic ARB_gpu_shader_int64 types

This adds the builtins and the lexer support.

To avoid too many warnings, it adds basic support to the type in a few
other places in mesa, mostly in the trivial places.

It also adds a query to be used later for if a type is an integer 32 or 64.

Signed-off-by: Dave Airlie <airlied@redhat.com>
Reviewed-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Matt Turner <mattst88@gmail.com>

src/compiler/glsl/link_uniform_initializers.cpp

@@ -70,6 +70,8 @@ copy_constant_to_storage(union gl_constant_value *storage,
       case GLSL_TYPE_BOOL:
          storage[i].b = val->value.b[i] ? boolean_true : 0;
          break;
+      case GLSL_TYPE_INT64:
+      case GLSL_TYPE_UINT64:
       case GLSL_TYPE_ARRAY:
       case GLSL_TYPE_STRUCT:
       case GLSL_TYPE_IMAGE: