[perl #118505] Null PMC access when declaring constant for export twice

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> constant %a is export = 5 => 5
5 => 5
> constant %a is export = 5 => 5
Null PMC access in get_string()


On a related note, it's possible to re-declare constants. Not sure if
that's a bug or not.
> constant %b = 1 => 1
1 => 1
> constant %b = 1 => 2
1 => 2

> constant %a is export = 5 => 5
5 => 5
> constant %a is export = 5 => 5
Null PMC access in get_string()

On a related note, it's possible to re-declare constants. Not sure if that's a bug or not.

> constant %b = 1 => 1
1 => 1
> constant %b = 1 => 2
1 => 2