Merging r283223:

r283223 | davidsh | 2016-10-04 10:41:36 -0400 (Tue, 04 Oct 2016) | 1 line

[OpenMP] fix segfault when a variable referenced in reduction clause is a reference parameter
Differential Revision: http://reviews.llvm.org/D24524

llvm-svn: 286972