Remove feature gates from std and tests

src/libcore/tests/lib.rs

@@ -26,7 +26,6 @@
 #![feature(test)]
 #![feature(trusted_len)]
 #![feature(try_trait)]
-#![feature(align_offset)]
 #![feature(reverse_bits)]
 #![feature(inner_deref)]
 #![feature(slice_internals)]

src/libstd/lib.rs

@@ -227,7 +227,6 @@
 // std is implemented with unstable features, many of which are internal
 // compiler details that will never be stable
 // NB: the following list is sorted to minimize merge conflicts.
-#![feature(align_offset)]
 #![feature(alloc_error_handler)]
 #![feature(alloc_layout_extra)]
 #![feature(allocator_api)]