RFR JDK-8207401: [lworld] TestLWorld.java crashes java_lang_String::create_from_symbol

[mandy chung]

The class name symbol is lazily set in InstanceKlass::_value_types array
and hence when JVM_GetLocalValueTypes is called, _class_name symbol
may be NULL in some entries. I will have to investigate further why
the test didn't fail in my mach5 run but it fails in local run and
might be timing issue if multiple tests were run in the agent vm.

I ran all jdk, runtime, compiler, javac valhalla tests with one
known failure TestNewAcmp.java.

http://cr.openjdk.java.net/~mchung/valhalla/webrevs/8207401/webrev.00/

Mandy