Merge "String16 is moveable (noexcept)" am: 3551e457ca am: 32ceaa1299 am: dcd1cacbbb am: 131315c51c

Original change: https://android-review.googlesource.com/c/platform/system/core/+/1749261

Change-Id: I2ded754cebb3d529f1adc2413cfa8f11f108a556