[llvm] [llubi] Implement memory manipulation intrinsics (PR #204932)

[Antonio Frighetto via llvm-commits]

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@@ -698,6 +699,120 @@ class InstExecutor : public InstVisitor<InstExecutor, void>,
     return V.asInteger();
   }
 
+  AnyValue callMemTransferIntrinsic(ArrayRef<AnyValue> Args,
+                                    Intrinsic::ID IID) {
+    if (Args[2].isPoison()) {
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antoniofrighetto wrote:

I think it would help make the code more readable to have, e.g.:

```suggestion
    const AnyValue &Dest = Args[0], &Src = Args[1], &Length = Args[2];
```
And directly work on these objects, same for memset (maybe also worth adding a TODO in the code for volatile as a future work).

https://github.com/llvm/llvm-project/pull/204932