libgomp: Implementing REDUCTION clause

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1 9.9 Implementing REDUCTION clause
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1 The private struct mentioned in the previous section should have a
1 pointer to an array of the type of the variable, indexed by the thread's
1 TEAM_ID.  The thread stores its final value into the array, and after
1 the barrier, the master thread iterates over the array to collect the
1 values.
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