Improve lc support for iNext and wp_pure
This is part of #441.
iNext credit: H decreases the credit in H and clear it when credit is zero. wp_pure credit: H now bumps up credit in H by 1 if H is an existing credit.
This is part of #441.
iNext credit: H decreases the credit in H and clear it when credit is zero. wp_pure credit: H now bumps up credit in H by 1 if H is an existing credit.