[OpenMP] Add missing regression test for pragma distribute, clause firstprivate
[OpenMP] Add missing regression test for pragma distribute, clause firstprivate

https://reviews.llvm.org/D28243

The regression test was missing from the previous already accepted patch.



git-svn-id: ffe668792ed300d6c2daa1f6eba2e0aa28d7ec6c@294026 91177308-0d34-0410-b5e6-96231b3b80d8

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