Auto merge of rust-lang#57336 - ehuss:bump-stage0, r=alexcrichton

Bump stage0

Updates stage 0
From: rustc 1.32.0-beta.2 (a01e476 2018-12-08)
To:   rustc 1.32.0-beta.11 (e64fee6 2019-01-04)

Intended to pull in rust-lang#57292 which will fix rust-lang#57142.

The following is a list of PRs this also pulls in in case anyone is interested in seeing the changes:

rust-lang#56930
rust-lang#56961
rust-lang#57236
rust-lang#57305

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: 2018-12-09
+date: 2019-01-04
 rustc: beta
 cargo: beta