microsoft/compiler: Emit metadata based on long-lived signature data

microsoft/compiler: Emit metadata based on long-lived signature data

Instead of using the short-lived semantic structure (that's used to
fill out the long-lived signature and PSV data), use the long-lived
ones. This is staging so we can hold off on emitting the metadata
until later.

Reviewed-by: Enrico Galli <enrico.galli@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/17603>