Changes to ghc(2)

Changes to ghc:
commit 719108f8d70aa50cdaccf564dbc463445a03988e
Author: Dr. ERDI Gergo <gergo@erdi.hu>
Date:   Sun Feb 9 17:27:24 2014 +0800

    Add test suite for #8757

commit e0a55415545074bc7a757462624079f54f7785e2
Author: Dr. ERDI Gergo <gergo@erdi.hu>
Date:   Sun Feb 9 17:20:34 2014 +0800

    Issue an error for pattern synonyms defined in a local scope (#8757)

    This also fixes the internal crash when using pattern synonyms
    in GHCi (#8749)