Rollup merge of #142983 - compiler-errors:taint-invalid-call-abi, r=workingjubilee

Taint body on invalid call ABI

Fixes rust-lang/rust#142969

I'm not certain if there are any other paths that should be tainted, but they would operate similarly. Perhaps pointer coercion.

Introduces `extern "rust-invalid"` for testing purposes.

r? ```@workingjubilee``` or ```@oli-obk``` (or anyone)

Author: workingjubilee