spirv: parse unstructured CFG

v2 (Boris Brezillon): handle functions with return values
v3: call structurizer
v4: entire rewrite
v5: fix handling of already visited default branches
v2 (Jason Ekstrand): Stop walking hash tables

Signed-off-by: Karol Herbst <kherbst@redhat.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Tested-by: Jesse Natalie <jenatali@microsoft.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/2401>
4 files changed