gobject: Speed up property lookup

When the param specs are provided as an array
with g_object_class_install_properties, keep
a copy of that array around and use it for
looking up properties without the param spec
14 jobs for gobject-speedups4 in 24 minutes and 49 seconds (queued for 1 second)
Name Stage Failure
style-check-diff Style Check
- test_refcount_print_result
- }
+ test_refcount_print_result }

static PerformanceTest *
Cleaning up project directory and file based variables
ERROR: Job failed: exit code 1