Port e56a7edb https://crrev.com/c/2002547
Port e15f5ba1 https://crrev.com/c/2011829
Port bc436ed7 https://crrev.com/c/2030731

Original Commit Message:

  The instruction selector assumed for Word32AtomicPair{Load, Binops,
  CompareExchange} nodes that if there exists a Projection(1) user, then
  there also exists a Projection(0) user. This, however, is not the case,
  because TurboFan eliminates unreachable nodes. The missing projection
  node lead to a failed DCHECK in the register allocator.

Change-Id: I498f751c0c0a4a609f0016d17269eab8f6727229
Reviewed-on: https://chromium-review.googlesource.com/c/v8/v8/+/2056886Reviewed-by: Deepti Gandluri <gdeepti@chromium.org>
Commit-Queue: Deepti Gandluri <gdeepti@chromium.org>
Auto-Submit: Zhao Jiazhong <zhaojiazhong-hf@loongson.cn>
Cr-Commit-Position: refs/heads/master@{#66361}