RFR: Backport: 8222079: Don't use memset to initialize fields decode_env constructor in disassembler.cpp

[Zhengyu Gu]

Looks fine to me.

-Zhengyu

On 8/25/20 7:37 AM, Roman Kennke wrote:
> This backports:
> https://bugs.openjdk.java.net/browse/JDK-8222079
> 
> It fixes UB and makes newer compilers happy.
> 
> It's based on the jdk11u change:
> http://cr.openjdk.java.net/~rkennke/JDK-8222079-jdk11u/webrev.00/
> 
> It is a fairly straight backport and for the most part matches the
> jdk11u variant, except that in jdk8u, we don't have an _offset field
> and ctor argument, but we do have an additional _total_ticks field.
> 
> JDK8u webrev:
> http://cr.openjdk.java.net/~rkennke/JDK-8222079-jdk8u/webrev.00/
> 
> Can I please get a review?
> 
> Thanks,
> Roman
> 
>