review (XS) for 7019819: bare oop in ciField

[Vladimir Kozlov]

Talked with Tom, should use Handle here so changes are fine.

Vladimir

Vladimir Kozlov wrote:
> Should we use KlassHandle instead of simple Handle?
> 
> Vladimir
> 
> Tom Rodriguez wrote:
>> http://cr.openjdk.java.net/~never/7019819
>>
>> 7019819: bare oop in ciField
>> Reviewed-by:
>>
>> This appears to be a long standing issue though it was previously
>> unlikely to occur.  There's a bare oop in initialize_from over a call
>> to ciField::type which may call compute_type, which make call into
>> ciEnv::get_klass_by_name_impl where a safepoint could potentially
>> occur.  The fix for 6354181 added acquire of the Compile_lock which
>> made it more likely that we might safepoint here.  The fix is properly
>> handleize the oop over the call.  Tested with failing test from nightly.