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from c2a8447 [SCCP] Zap multiple return values. new 991d814 [GVNHoist] Don't hoist PHI nodes new e212aa9 [AArch64][FastISel] Select atomic stores into STLR. new 5181825 [AArch64][FastISel] Select -O0 legal cmpxchg.

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Summary of changes: lib/Target/AArch64/AArch64FastISel.cpp | 98 +++++++++++- lib/Transforms/Scalar/GVNHoist.cpp | 12 +- test/CodeGen/AArch64/cmpxchg-O0.ll | 2 +- test/CodeGen/AArch64/fast-isel-atomic.ll | 244 ++++++++++++++++++++++++++++++ test/CodeGen/AArch64/fast-isel-cmpxchg.ll | 72 +++++++++ test/Transforms/GVN/pr28626.ll | 42 +++++ 6 files changed, 462 insertions(+), 8 deletions(-) create mode 100644 test/CodeGen/AArch64/fast-isel-atomic.ll create mode 100644 test/CodeGen/AArch64/fast-isel-cmpxchg.ll create mode 100644 test/Transforms/GVN/pr28626.ll