Merge "libutils: Improve performance of utf8_to_utf16/utf16_to_utf8" into main am: e91538a6de am: bb9051943c am: b9b14eae78

Original change: https://android-review.googlesource.com/c/platform/system/core/+/2653891

Change-Id: Ib4d31601a00c3590cc53f5772aa89a331c13cf6d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>