Correct types of pointers to doacross_num_done
Correct types of pointers to doacross_num_done

This field is defined as kmp_int32, so we should use neither
pointers to kmp_int64 nor 64 bit atomic instructions.
(Found while testing on a Raspberry Pi, 32 bit ARM)

Differential Revision: https://reviews.llvm.org/D41656

git-svn-id: f99161ee8ccfe2101cbe1bdda2220bce2ed25485@321964 91177308-0d34-0410-b5e6-96231b3b80d8

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