[llvm] [GISel][RISCV]Implement indirect parameter passing (PR #95429)

[Sergei Barannikov via llvm-commits]

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@@ -798,15 +857,19 @@ bool CallLowering::handleAssignments(ValueHandler &Handler,
         // store. We may need to adjust the offset for big endian targets.
         LLT MemTy = Handler.getStackValueStoreType(DL, VA, Flags);
 
-        MachinePointerInfo MPO;
+        MachinePointerInfo MPO(ArgReg);
         Register StackAddr = Handler.getStackAddress(
             MemTy.getSizeInBytes(), VA.getLocMemOffset(), MPO, Flags);
 
-        Handler.assignValueToAddress(Args[i], Part, StackAddr, MemTy, MPO, VA);
-        continue;
-      }
+        // Finish the handling of indirect passing from the passers
+        // (OutgoingParameterHandler) side
----------------
s-barannikov wrote:

```suggestion
        // (OutgoingParameterHandler) side.
```

https://github.com/llvm/llvm-project/pull/95429