[llvm] [RISCV] Port RISCVZacasABIFix to NewPM (PR #214866)

[Pengcheng Wang via llvm-commits]

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@@ -112,8 +112,17 @@ void initializeRISCVLoadStoreOptPass(PassRegistry &);
 FunctionPass *createRISCVPreAllocZilsdOptPass();
 void initializeRISCVPreAllocZilsdOptPass(PassRegistry &);
 
+class RISCVZacasABIFixPass
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wangpc-pp wrote:

Make it a forward declaration here and put the real class in `RISCVZacasABIFix.cpp`?

https://github.com/llvm/llvm-project/pull/214866