perldelta for mutable inlining & folding

perldelta for mutable inlining & folding

2484f8d Stop folding of ops from changing mutability
94d5c17 Stop constant.pm from (ab)using subs for scalars
6f1b3ab Allow stash elems to be array refs
f815dc1 Inline list constants
c5a2441 Update constant.pm to reflect list inlinement
08f3c42 Tweak optree_constants.t for inlined list consts
d244020 Make sub(){42} return a mutable value
0ad6fa3 Stop op freeing from interfering with sub(){42} mutability