Auto merge of #5537 - eddyb:no-trans, r=matklad

Remove -Zno-trans test.

Needed for https://github.com/rust-lang/rust/pull/50615 (where the flag is now `-Zno-codegen`) - which revealed that the test shouldn't even exist anymore, and was accidentally added back (https://github.com/rust-lang/rust/pull/50615#issuecomment-388968326).