darcs patch: add negative-prim-literal tests (and 2 more)

[Isaac Dupree]

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Isaac Dupree wrote:
> Unfortunately "add negative-prim-literal tests" (according to darcs)
> depends on "#1318: pre-emptively add test for..."; either the patches
> could be reworked, or we could just get that one reviewed and fixed up
> first/simultaneously (see my comments in its e-mail)

I'll push these tests and ghc-patch if I don't get a reply by the end of
 Monday June 4 (the tests work fine for me, they just seem a little odd,
so if there's a need someone can just refactor them later)

Isaac
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