Fix for PR#16009 -- TRE problems with wchar character classes.

git-svn-id: https://svn.r-project.org/R/trunk@66731 00db46b3-68df-0310-9c12-caf00c1e9a41
Test for r66731

git-svn-id: https://svn.r-project.org/R/trunk@66732 00db46b3-68df-0310-9c12-caf00c1e9a41