ICU-12992 add char16ptr.h with pointer conversions; use Char16Ptr for input parameter...

X-SVN-Rev: 39762

diff --cc icu4c/source/common/unicode/casemap.h
Simple merge

diff --cc icu4c/source/common/unicode/umachine.h
Simple merge

diff --cc icu4c/source/common/unicode/unistr.h
Simple merge

diff --cc icu4c/source/test/intltest/ustrtest.cpp
Simple merge

diff --cc icu4c/source/tools/gennorm2/n2builder.cpp
Simple merge