Auto merge of #58543 - jonas-schievink:bumpstrap, r=pietroalbini

Bump the bootstrap compiler

This compiler includes #58501, which fixes an annoying ICE while working on rustc itself.

r? @pietroalbini

Author: bors

src/stage0.txt

@@ -12,7 +12,7 @@
 # source tarball for a stable release you'll likely see `1.x.0` for rustc and
 # `0.x.0` for Cargo where they were released on `date`.
 
-date: 2019-01-18
+date: 2019-02-17
 rustc: beta
 cargo: beta