Revert "fix tests in `librustc_driver`"
Revert "fix tests in `librustc_driver`"

This reverts commit 17df455c2eda9717e2d7ff2f43809b553852d7e6.

GBGamer/rust,GBGamer/rust,GBGamer/rust,graydon/rust,graydon/rust,aidancully/rust,aidancully/rust,GBGamer/rust,graydon/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,GBGamer/rust,aidancully/rust,graydon/rust,aidancully/rust,aidancully/rust,aidancully/rust,graydon/rust,graydon/rust