linker: Avoid logcat spam with some blobs

Many of pre-kitkat blobs would emit a "text relocations" warning which makes logcat completely unreadable.
This commit will hide this warning to prevent it.

Change-Id: I8f32b5bbfea33d732320b3ac29da6b0027fbd521
libc: krait: Implement optimized versions of memmove and bcopy

Restore a jellybean optimization for memmove and bcopy on krait.
Code has been refactored to thumb2 for consistency with the rest of
bionic libc, as well as performance and correctness.

Change-Id: I8f2f77dce4534fbce1bdf0188ab353bf34ab8637