[perl #123029] 5.20.x regression in "state" under PERL_NO_COW

This looks well-formed to me for a maint change, though I don't claim to entirely understand that part of the core. With that caveat aside, given that it fixes this regression in 5.20, I vote +1 to backporting it to maint.

Thanks, Father Chrysostomos.

-- 
Aaron Crane ** http://aaroncrane.co.uk/

• [perl #123029] 5.20.x regression in "state" under PERL_NO_COW by Father Chrysostomos via RT
• Re: [perl #123029] 5.20.x regression in "state" under PERL_NO_COW by James E Keenan
• Re: [perl #123029] 5.20.x regression in "state" under PERL_NO_COW by Aaron Crane
• [perl #123029] 5.20.x regression in "state" under PERL_NO_COW by Father Chrysostomos via RT
• [perl #123029] 5.20.x regression in "state" under PERL_NO_COW by Father Chrysostomos via RT
• [perl #123029] 5.20.x regression in "state" under PERL_NO_COW by Aaron Crane via RT
• [perl #123029] 5.20.x regression in "state" under PERL_NO_COW by Aaron Crane via RT
• [perl #123029] 5.20.x regression in "state" under PERL_NO_COW by Aaron Crane