Merge ref '383b9c447b61' from rust-lang/rust

Pull recent changes from https://github.com/rust-lang/rust via Josh.

Upstream ref: 383b9c447b61641e1f1a3850253944a897a60827
Filtered ref: 14b7b0b

This merge was created using https://github.com/rust-lang/josh-sync.

Author: The rustc-josh-sync Cronjob Bot

src/tests/directives.md

@@ -297,6 +297,7 @@ See [Pretty-printer](compiletest.md#pretty-printer-tests).
 - [`should-ice`](compiletest.md#incremental-tests) — incremental cfail should
       ICE
 - [`reference`] — an annotation linking to a rule in the reference
+- `disable-gdb-pretty-printers` — disable gdb pretty printers for debuginfo tests
 
 [`reference`]: https://github.com/rust-lang/reference/blob/master/docs/authoring.md#test-rule-annotations