Don't break string literals in Java and JavaScript.

The proper way to break string literals in these languages is by inserting a "+"
between parts which we don't support yet. So we disable string literal breaking
until then.



git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@224120 91177308-0d34-0410-b5e6-96231b3b80d8