Request for review:8021948:Change InstanceKlass::_source_file_name and _generic_signature from Symbol* to constant pool index

[Jiangli Zhou]

Hi,

Please review following change for JDK-8021948 
<https://jbs.oracle.com/bugs/browse/JDK-8021948>:

   http://cr.openjdk.java.net/~jiangli/8021948/webrev.00/

Both InstanceKlass::_source_file_name and 
InstanceKlass::_generic_signature were pointers to Symbol. They are now 
indexes to constant pool entries. Both fields are now u2 type, and 
co-located with other non-pointer type fields for more efficient 
alignment on 64-bit machine. On 32-bit machine, the change saves 4bytes 
for each class.

Tested with JPRT, vm.quick.testlist, nsk.sajdi.testlist, 
nsk.stress.testlist and nsk.jvmti.testlist.

Thanks,
Jiangli
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