rustc: Give glue symbols meaningful names

Instead of `glue_drop1234` it's `Type::<hash>::glue_drop1234`

Haven't done any performance testing.
core: remove iter_bytes helper functions
cleanup warnings from libstd
cleanup warnings from libextra
cleanup warnings from libsyntax
cleanup warnings from librustc
cleanup warnings from librusti
cleanup warnings from librustdoc
cleanup warnings from compiletest
cleanup warnings from librustpkg
Fix some std/extra language in the tutorial
auto merge of #6690 : erickt/rust/cleanup-warnings, r=brson

Simple patch series to fix up all the warnings a rustc compile is giving at the moment. It also fixes a NOTE in `to_bytes.rs` to remove the `to_bytes::iter_bytes_<N>` functions.
swap_ptr: rm equality check

This isn't needed semantically, and it's the wrong case to optimize for.
add memcpy intrinsic to mirror memmove
indentation fix
make arm register definition consistent with rt
optimize util::swap, &mut pointers never alias
docs: Don't mention obsolete move operator, as per #5700
auto merge of #6684 : crabtw/rust/arm, r=ILyoan

It seems to fix #6231.
auto merge of #6710 : thestinger/rust/swap, r=catamorphism