intel: add INTEL_DEBUG=shaders

Signed-off-by: Marcin Ślusarz <marcin.slusarz@intel.com>
Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6559>

src/intel/dev/gen_debug.c

@@ -94,6 +94,8 @@ static const struct debug_control debug_control[] = {
    { "pc",          DEBUG_PIPE_CONTROL },
    { "nofc",        DEBUG_NO_FAST_CLEAR },
    { "no32",        DEBUG_NO32 },
+   { "shaders",     DEBUG_WM | DEBUG_VS | DEBUG_TCS |
+                    DEBUG_TES | DEBUG_GS | DEBUG_CS },
    { NULL,    0 }
 };