[Bug libstdc++/91156] The associated Laguerre polynomial should allow negative arguments.

[emsr at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91156

emsr at gcc dot gnu.org changed:

           What    |Removed                     |Added
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  Attachment #46598|0                           |1
        is obsolete|                            |

--- Comment #5 from emsr at gcc dot gnu.org ---
Created attachment 46600
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=46600&action=edit
Fix testcases for just x < 0.

The last patch accidentally brought in other changes and failed.
This patch is just about x < 0 for laguerre and assoc_laguerre and passes on
x86_64-linux.