Add strlen tests. DO NOT MERGE

Merge from internal master.

(cherry-picked from from commit a63c049f23c49b6345bf2c845a415109c5471ebe)

Change-Id: I443a866a4b146a8043dd84cf6b7c090ecd529519
Merge "Add strlen tests. DO NOT MERGE"
Adding strlen, strcat, strcpy benchmarks.

Merge from internal master.

(cherry-picked from 7401bc1263d9b9d9f7605a3c5bdaaf3171c7e9c0)

Change-Id: I7139a96022540c3604dd38f7f7836c8823e540dc
Merge "Adding strlen, strcat, strcpy benchmarks."
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
Merge "Add tests for strcpy and strcat."
Add a static version of the test.

Merge from internal master.

(cherry-picked from 4052fe181a499f52729b7178f11ae91212823682)

Change-Id: I90d1320e8d8032d82909a2a7435fda9ee3ec1fdb
Merge "Add a static version of the test."
Merge branch 'master' of https://android.googlesource.com/platform/system/extras