Merge "libutil: no special copy from StaticString16" am: 7d067aee62 am: ece939ecc9 am: b8e683537f

Original change: https://android-review.googlesource.com/c/platform/system/core/+/1751786

Change-Id: I6dd878e4f9196d795677e10cdecd55cd2f8d6868