there is a corresponding italic Mathematical Alphanumeric Symbol. Accept non-BMP characters in nsMathMLOperator::LookupInvariantChar. Update the mathvariant entries in mathfont.properties from PUA characters to their Plane 1 Unicode assignments (remainder of bug 289938). b=413115, r+sr=roc. git-svn-id: svn://10.0.0.236/trunk@247922 18797224-902f-48f8-a5cc-f745e15eee43