[WebAssembly] Enable atomic expansion for unsupported atomicrmws
Summary:
Wasm does not have direct counterparts to some of LLVM IR's atomicrmw
instructions (min, max, umin, umax, and nand). This enables atomic
expansion using cmpxchg instruction within a loop for those atomicrmw
instructions.
Reviewers: dschuff
Subscribers: sbc100, jgravelle-google, sunfish, llvm-commits
Differential Revision: https://reviews.llvm.org/D49440
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@339084
91177308-0d34-0410-b5e6-
96231b3b80d8
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