Up the LLVM

Fixes #36474

src/llvm

@@ -1 +1 @@
-Subproject commit 16b79d01fd6d942cf3c9120b92df56b13ec92665
+Subproject commit 7801978ec1f3637fcda1b564048ebc732bf586af

src/rustllvm/llvm-auto-clean-trigger

@@ -1,4 +1,4 @@
 # If this file is modified, then llvm will be forcibly cleaned and then rebuilt.
 # The actual contents of this file do not matter, but to trigger a change on the
 # build bots then the contents should be changed so git updates the mtime.
-2016-08-30
+2016-09-17

src/test/run-pass/issue-36474.rs

@@ -0,0 +1,40 @@
+// Copyright 2016 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.
+
+fn main() {
+    remove_axis(&3, 0);
+}
+
+trait Dimension {
+    fn slice(&self) -> &[usize];
+}
+
+impl Dimension for () {
+    fn slice(&self) -> &[usize] { &[] }
+}
+
+impl Dimension for usize {
+    fn slice(&self) -> &[usize] {
+        unsafe {
+            ::std::slice::from_raw_parts(self, 1)
+        }
+    }
+}
+
+fn remove_axis(value: &usize, axis: usize) -> () {
+    let tup = ();
+    let mut it = tup.slice().iter();
+    for (i, _) in value.slice().iter().enumerate() {
+        if i == axis {
+            continue;
+        }
+        it.next();
+    }
+}