Auto merge of #48053 - Manishearth:rollup, r=Manishearth

Rollup of 10 pull requests

- Successful merges: #47613, #47631, #47810, #47883, #47922, #47944, #48014, #48018, #48020, #48028
- Failed merges:

1 files changed, 23 insertions, 0 deletions

diff --git a/src/test/codegen/repeat-trusted-len.rs b/src/test/codegen/repeat-trusted-len.rs
new file mode 100644
index 00000000000..43872f15d51
--- /dev/null
+++ b/src/test/codegen/repeat-trusted-len.rs
@@ -0,0 +1,23 @@
+// Copyright 2018 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// compile-flags: -O
+// ignore-tidy-linelength
+
+#![crate_type = "lib"]
+
+use std::iter;
+
+// CHECK-LABEL: @repeat_take_collect
+#[no_mangle]
+pub fn repeat_take_collect() -> Vec<u8> {
+// CHECK: call void @llvm.memset.p0i8
+    iter::repeat(42).take(100000).collect()
+}