Auto merge of #944 - rust-lang:rustup, r=oli-obk

Rustup to 1.39.0-nightly (1e869133b 2019-09-09)

Author: bors

rust-version

@@ -1 +1 @@
-4894123d21ed4b153a2e5c32c0870cb2d97f9b46
+1e869133b9888dc5abde54f4f31cb797ed9c7874

tests/compile-fail/stack_free.rs

@@ -1,7 +1,7 @@
 // Validation changes why we fail
 // compile-flags: -Zmiri-disable-validation
 
-// error-pattern: tried to deallocate Stack memory but gave Machine(Rust) as the kind
+// error-pattern: tried to deallocate `Stack` memory but gave `Machine(Rust)` as the kind
 
 fn main() {
     let x = 42;