[OpenMP][OMPT] Fix unsafe initialization of ompt_data_t objects
[OpenMP][OMPT] Fix unsafe initialization of ompt_data_t objects

Initializing an ompt_data_t object using the pointer union member is potentially
unsafe in 32-bit programs.  This change fixes the issue
by using the constant, ompt_data_none.

Patch by Hansang Bae

Differential Revision: https://reviews.llvm.org/D52046


git-svn-id: f99161ee8ccfe2101cbe1bdda2220bce2ed25485@343785 91177308-0d34-0410-b5e6-96231b3b80d8

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