RFR: 8135284: Remove Method::_method_size field

[Yumin Qi]

Harold,

Thanks for the review!

On 10/13/2015 6:50 AM, harold seigel wrote:
> Hi Yumin,
>
> The fix looks good.
>
> Thanks, Harold
>
> On 10/12/2015 6:01 PM, Yumin Qi wrote:
>> Please review the small changes for
>>
>> bug: https://bugs.openjdk.java.net/browse/JDK-8135284
>> webrev: http://cr.openjdk.java.net/~minqi/8135284/webrev00/
>>
>> Summary: After JDK-8135085 integration, Method increased 4 bytes for 
>> 32-bit platforms(no effect for 64 bit). This change removed 
>> _method_size from Method which saved 2 bytes for Method. Deleted 
>> method_size related code in SA. The Method size is a constant in 
>> Method Type, if it is native method then _*TWO*_ words added which is 
>> consistent with hotspot code. btyecodeOffset in Method.java is no 
>> longer useful, the offset is now in ConstMethod so removed too.
>>
>> Tests: JPRT, Runtime Quick test list, run SA on 
>> sun.jvm.hotspot.tools.ClassLoaderStats (instrumented Method output to 
>> get size).
>>
>> Thanks
>> Yumin
>