Rollup merge of #120944 - compiler-errors:inliner-abi, r=oli-obk

Check that the ABI of the instance we are inlining is correct

When computing the `CallSite` in the mir inliner, double check that the instance of the function that we are inlining is compatible with the signature from the trait definition that we acquire from the MIR.

Fixes #120940

r? ``@oli-obk`` or ``@cjgillot``

Author: matthiaskrgr