Fix debugger calling new String().

Used to return an empty string instead of the newly created String.
Requires accompanying jdwp test fix to test String contents.

Bug: 30951794
Change-Id: I27a8e0afcbe7e32a14dd3c394e44b6cd4d3c58f6
Test: mm -j24 run-jdwp-tests-host
1 file changed