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Move various mips-only things into the arch-mips directory. As soon as mips
writes assembler replacements, we can remove these.

Change-Id: Ia7308559bc361f5c8df3e1d456b381865e060b93

Interestingly, this mostly involves cleaning up our implementation of
various <string.h> functions.

Change-Id: Ifaef49b5cb997134f7bc0cc31bdac844bdb9e089

This patch removes the string/ and wchar/ directories.

Change-Id: Ia489904bc67047e4bc79acb1f3eec21aa3fe5f0d