Scalable vector ABI check seems incomplete

https://github.com/rust-lang/rust/pull/143924 extended the ABI checks that we run during monomorphization to also cover scalable vectors. However, those ABI checks were only meant to catch "C" ABI problems, and they are therefore partially disabled for "Rust" ABI calls. Specifically, while we are checking "Rust" ABI definitions, we are not checking "Rust" ABI calls:

https://github.com/rust-lang/rust/blob/973c3f61d443e2ae157cd6a9275fe7635cbe0e70/compiler/rustc_monomorphize/src/mono_checks/abi_check.rs#L199-L205

One can therefore compile this code without having the scalable vector target feature enabled:

fn foo(f: fn() -> svint32_t) {
  let _x = f();
}

At least, that's what I would expect; I don't have the setup to test this.

Cc @davidtwco @workingjubilee
Tracking issue: https://github.com/rust-lang/rust/issues/145052

Start in compiler/rustc_monomorphize/src/mono_checks/abi_check.rs around lines 199-205 and compare the existing Rust ABI definition handling with Rust ABI calls. Use the scalable-vector function-pointer example in the issue as the reproduction case. Done means the call is checked consistently and the example cannot compile without the scalable vector target feature.