RFR (XL): 8208669: GC changes to allow enabling -Wreorder

[Per Liden]

Hi Thomas,

On 08/06/2018 02:35 PM, Thomas Schatzl wrote:
> 
> http://cr.openjdk.java.net/~tschatzl/8208669/webrev.1 (full)
> http://cr.openjdk.java.net/~tschatzl/8208669/webrev.0_to_1 (diff)
> 

Looks good. Thanks for fixing this.

/Per