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91da841387
Basically two parts to this fix: 1. Stop using AtomicExpand to expand cmpxchg i128 2. Fix AArch64ExpandPseudoInsts to use a correct expansion. From ARM architecture reference: To atomically load two 64-bit quantities, perform a Load-Exclusive pair/Store-Exclusive pair sequence of reading and writing the same value for which the Store-Exclusive pair succeeds, and use the read values from the Load-Exclusive pair. Fixes https://bugs.llvm.org/show_bug.cgi?id=51102 Differential Revision: https://reviews.llvm.org/D106039
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