Replace all ConstArrayRef with ArrayRef<const T>

Replace all ConstArrayRef with ArrayRef<const T>

1) Remove the alias itself in arrayref.h.
2) All replacements done automatically using sed:
s#ConstArrayRef<const char \*>#ArrayRef<const char *const>#
s#ConstArrayRef<\(.*\)>#ArrayRef<const \1>#

This worked because "const char*" was the only pointer type used as
template argument.

Change-Id: I5eba895a5dc235b95d77670b4f258e423f64f3b8