glsl: add EXT_shader_image_load_store new image functions

This extension has 2 functions that are missing from the ARB versions:
- imageAtomicIncWrap
- imageAtomicDecWrap

Reviewed-by: Marek Olšák <marek.olsak@amd.com>

src/compiler/glsl/ir.h

@@ -1106,6 +1106,8 @@ enum ir_intrinsic_id {
    ir_intrinsic_image_atomic_comp_swap,
    ir_intrinsic_image_size,
    ir_intrinsic_image_samples,
+   ir_intrinsic_image_atomic_inc_wrap,
+   ir_intrinsic_image_atomic_dec_wrap,
 
    ir_intrinsic_ssbo_load,
    ir_intrinsic_ssbo_store = MAKE_INTRINSIC_FOR_TYPE(store, ssbo),