Fixes for 32 bit build on linux

[Tobias Hartmann]

Hi Roland,

On 15.02.2017 14:37, Roland Westrelin wrote:
> My changes to the calling convention API broke the build on 32 bit linux:
> 
> http://cr.openjdk.java.net/~roland/valhalla/32bit-build/webrev.00/

Looks good to me, thanks for fixing the problem I introduced in fieldDescriptor.cpp!

Best regards,
Tobias