Add new tests for memory/string routines.

Create a few generic testing functions to allow any memory/string tests
to be created.

Add alignment tests for memcpy/memset/strcat/strcpy/strlen.

Add an overread test for memcpy/strcat/strcpy/strlen. This test attempts
to verify that the functions do not read past the end of their buffers
(src buffer in the case of src/dst functions).

Bug: 9797008

Change-Id: Ib3223ca1b99e729ae8229adc2d03f4dc3103d97c
4 files changed