[PATCH] Add test for LinkModules warning on triple, modified by r203009. Datalayout is already tested.

[Rafael Espíndola]

>
> ; RUN: cat %t.a.err | FileCheck --check-prefix=WARN-A %s
> WARN-A-NOT:  WARNING: Linking two modules of different target triples:

Hi Manman, this WARN-A is over the previous FileCheck run, so I don't
think this WARN-A-NOT has any value, it is trivially true.

Cheers,
Rafael