Make the details array in universal.c static

Otherwise we can have linking problems when a global ‘details’ symbol
is defined elsewhere.  (That happened to me with an XS module.)
Fix bare blocks in lvalue subs

If a bare block is the last thing in an lvalue sub, OP_LEAVELOOP needs
to propagate lvalue context and handle returned arrays properly, just
as OP_LEAVE has done since yesterday.

This is a follow-up to 2ec7f6f24289.  This came up in ticket #119797.
Restore prev. behaviour of @a||... in lv sub

$ perl5.18.1 -lwe 'my @a;  sub i:lvalue {@a||@b} @a=1; (i())=3'
Name "main::b" used only once: possible typo at -e line 1.
Useless assignment to a temporary at -e line 1.

Bleadperl:

$ ./perl -Ilib -lwe 'my @a; sub i:lvalue {@a||@b} @a=1; (i())=3'
Name "main::b" used only once: possible typo at -e line 1.
Can't return array to lvalue scalar context at -e line 1.

I accidentally changed it in commit 2ec7f6f242 by propagating the
lvalue context.  This commit changes it back by only flagging the
rv2av op as being in an lvalue sub if it is not already flagged as
being in scalar context.

The old behaviour was inconsistent, and this commit does restore it
(see the tests), but resolving that discrepancy is for a future commit
(if I ever get to it).

In any case, ‘Can't return array to lvalue scalar context’ is wrong.