Auto merge of #4009 - phansch:update_compiletest, r=phansch
Auto merge of #4009 - phansch:update_compiletest, r=phansch

Update compiletest_rs

This includes a fix that make ICEs appear in UI tests again.

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