[perl #90888] each(ARRAY) on scalar context should wrapped into defined()

"perldoc -f each" says that if each() is performed on ARRAY
in scalar context, it will return only the index in an array.
Calling each(HASH) in scalar context worked well but calling
each(ARRAY) didn't because it was not wrapped into defined OPCODE.

So, in Perl_newWHILEOP() and Perl_newLOOPOP(), they are modified
to check them and wrap with defined OP if needed.

In S_new_logop(), it's reasonable to warn if return value of
each(ARRAY) is being used for boolean value, as it's first return
value will be "0", the false.

issue: #90888
link: http://rt.perl.org/rt3/Public/Bug/Display.html?id=90888

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