[PATCH] D66794: Add atomic.fence instruction

[Heejin Ahn via Phabricator via llvm-commits]

aheejin created this revision.
aheejin added reviewers: dschuff, tlively.
Herald added subscribers: llvm-commits, jfb, sunfish, hiraditya, jgravelle-google, sbc100.
Herald added a project: LLVM.

This adds `atomic.fence` instruction:
https://github.com/WebAssembly/threads/blob/master/proposals/threads/Overview.md#fence-operator

And we now emit the new `atomic.fence` instruction for multithread
fences, rather than the prevous `atomic.rmw` hack.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D66794

Files:
  llvm/lib/Target/WebAssembly/WebAssemblyISelDAGToDAG.cpp
  llvm/lib/Target/WebAssembly/WebAssemblyInstrAtomics.td
  llvm/test/CodeGen/WebAssembly/atomic-fence.ll
  llvm/test/MC/WebAssembly/atomics-encodings.s

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