RFR: 8232648: ZGC: Move ATTRIBUTE_ALIGNED to the front of declarations

[Per Liden]

Looks good.

/Per

On 10/21/19 3:22 PM, Stefan Karlsson wrote:
> Hi all,
> 
> Please review this patch to move ATTRIBUTE_ALIGNED to the front of 
> declarations.
> 
> https://cr.openjdk.java.net/~stefank/8232648/webrev.01/
> https://bugs.openjdk.java.net/browse/JDK-8232648
> 
> This is done because the Windows compiler requires ATTRIBUTE_ALIGNED to 
> be put at the front of declarations. A new macro (ZCACHE_ALIGNED) is 
> introduced, and used, to shorten the affected lines.
> 
> Thanks,
> StefanK