Please review: (JDK-8044866) Fix raw and unchecked lint warnings in asm

[Kumar Srinivasan]

Hi Joe, all,

Please approve fix for removings warnings in asm, this is merely a mini 
refresh from
upstream sources, I have verified there are no more warnings in asm sources.
http://cr.openjdk.java.net/~ksrini/8044866/webrev/

Thanks
Kumar

PS: many thanks to Remi Forax for pushing these fixes  into the upstream 
source base.