RFR: turn off critical jni

[Andrew Haley]

On 04/15/2016 03:30 PM, Fedor Burdun wrote:
> Since aarch32 has no support critical jni entries (a most of required routines are unimplemented).
> I would like to suggest to turn off this feature.
> 
> The idea it to switching off this flag in VM_Version::initialize()
> although it is not the best place to do such things I can't find any better one.

OK, but we should probably think of this as temporary.  Please add
a FIXME comment.

Andrew.