Add tests for strcpy and strcat.

Also convert all of the different string length defines to a single
string length macro.

Move the string alignment loop to the top and make all alignment structures
const.

Merge from internal master.

(cherry-picked from 1c33ae7ce88efc23b627f5fdb74afc461fc8e4f5)

Change-Id: I973795cfff55975574dd1b17cc9b25d9f6932873
1 file changed