[PATCH] D153120: [LoongArch] Fix handling of the chain of CSRWR and CSRXCHG nodes

[Lu Weining via Phabricator via llvm-commits]

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`LoongArchISD::CSRWR` has two results. The first is the result of
`loongarch.csrwr.[wd]` intrinsic and the second is the chain. But
currently the chain is not processed correctly when creating this node,
resulting in the `csrwr` instruction being optimized out when the
result is not used by anyone. `LoongArchISD::CSRXCHG` has the same
issue.

This path addresses this issue.

Depends on D153119 <https://reviews.llvm.org/D153119>.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D153120

Files:
  llvm/lib/Target/LoongArch/LoongArchISelLowering.cpp
  llvm/lib/Target/LoongArch/LoongArchISelLowering.h
  llvm/test/CodeGen/LoongArch/intrinsic-la64.ll
  llvm/test/CodeGen/LoongArch/intrinsic.ll

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