[clang-tools-extra] [mlir] [clang-tidy][mlir] Add check for passing value type by reference. (PR #179882)

[Baranov Victor via cfe-commits]

vbvictor wrote:

I think we should make a generalised check (with types that can be configure).
In LLVM I can think of `SourceLocation` which is small and should be passed by value too.
Also, pass by value should be applied to built-in integer/floats and pointers.

------------------------------------------------------------

Isn't this a misleading behavoir?

```cpp
void badFunctionMutable(MyOp &op) {
  op = newOp()
}
```

What if someone overrides `op` inside function - then the check produces FP?

https://github.com/llvm/llvm-project/pull/179882