[foreign-memaccess] RFR 8226519: Add layout helper methods to obtain size and alignment in bytes

[Jorn Vernee]

Looks good, really like it!

Minor nit: In the javadoc of Layout::bytesAlignment, the int and short 
examples are still given in bits, instead of bytes.

Jorn

On 2019-06-20 16:35, Maurizio Cimadamore wrote:
> Subject says it all: let's get rid of all "/ 8" in the API/tests by
> offering handy (and safe) helpers which do the conversion.
> 
> Webrev:
> 
> http://cr.openjdk.java.net/~mcimadamore/panama/8226519/
> 
> I've also slightly renamed the alignment method - to make it
> consistent with the size one.
> 
> Cheers
> Maurizio