[OpenMP] Added memory scope to atomic::inc API and used the device scope in reduction. With https://reviews.llvm.org/D137524, memory scope and ordering attributes are being used to generate the required instructions for atomic inc/dec on AMDGPU. This patch adds the memory scope attribute to the atomic::inc API and uses the device scope in reduction. Without the device scope in atomic_inc, the default system scope leads to unnecessary L2 write-backs/invalidates. Reviewed By: arsenm Differential Revision: https://reviews.llvm.org/D154172
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