Test fixes from the rollup

Closes #15296 (Update disclaimer to improve clarity and intent)
Closes #15804 (Don't ICE when dealing with the count expr for fixed array types in various places.)
Closes #15893 (lint: Improve ffi-unsafe enum lint warning)
Closes #16045 (Rename Integer divides to is_multiple_of.)
Closes #16055 (manual: update list of feature gates, add phase attribute)
Closes #16056 (Improve documentation of rounding functions)
Closes #16061 (Remove references to non-existant functions in the std::path documentation)
Closes #16062 (Fix documentation error in MutableVectorAllocating::move_from)
Closes #16063 (adding discuss.rust-lang to community)
Closes #16064 (rustc: Switch dsymutil status => output)
Closes #16066 (making raw source display better)
Closes #16079 (doc: add missing word)
Closes #16080 (Update LLVM to fix miscompilations due to wrongfully removed lifetime intrinsics)
Closes #16084 (Elide lifetimes around Arc<T>.)
Closes #16085 (Gedit/gtksourceview language spec: add raw strings)
Closes #16086 (Implement Hash for DList)

src/test/pretty/issue-4264.pp

@@ -3,7 +3,7 @@
 #![feature(globs)]
 #[phase(plugin, link)]
 extern crate std = "std";
-extern crate native;
+extern crate rt = "native";
 use std::prelude::*;
 // Copyright 2014 The Rust Project Developers. See the COPYRIGHT
 // file at the top-level directory of this distribution and at