Move profiler code from util into a new crate profile.

- Most of util::memory has been moved into profile::mem, though the
  `SizeOf` trait and related things remain in util::memory. The
  `SystemMemoryReporter` code is now in a submodule
  profile::mem::system_reporter.

- util::time has been moved entirely into profile::time.

components/profile/lib.rs

@@ -0,0 +1,27 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#![feature(collections)]
+#![feature(core)]
+#![cfg_attr(target_os="linux", feature(io))]
+#![feature(old_io)]
+#![cfg_attr(target_os="linux", feature(page_size))]
+#![feature(rustc_private)]
+#![feature(std_misc)]
+#![cfg_attr(target_os="linux", feature(str_words))]
+
+#[macro_use] extern crate log;
+
+extern crate collections;
+extern crate libc;
+#[cfg(target_os="linux")]
+extern crate regex;
+#[cfg(target_os="macos")]
+extern crate task_info;
+extern crate "time" as std_time;
+extern crate util;
+extern crate url;
+
+pub mod mem;
+pub mod time;