2cd02e30d2
This change makes copy propagation pass faster. Complete link time spent in test case attached to bug 94477 goes down to ~400 secs from over 500 secs on my HSW machine. Does not fix the actual issue but brings down the total. No regressions seen in CI. v2: do not leak hash_table structure Signed-off-by: Tapani Pälli <tapani.palli@intel.com> Reviewed-by: Eric Anholt <eric@anholt.net>