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from 439da0cc70c [AArch64] Simplify WHILERW and WHILEWR definition new 05b0063b982 [amdgcn] Add support for sub-word sync_compare_and_swap operations

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Summary of changes: libgcc/ChangeLog | 5 ++++ libgcc/config/gcn/atomic.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++ libgcc/config/gcn/t-amdgcn | 3 ++- 3 files changed, 67 insertions(+), 1 deletion(-) create mode 100644 libgcc/config/gcn/atomic.c