RFR: (bulk) Fix build failures on Mac OS

[Roman Kennke]

Am 11.09.2017 um 17:30 schrieb Aleksey Shipilev:
> http://cr.openjdk.java.net/~shade/shenandoah/try-macos-fix/webrev.01/
> 
> This is a bulk fix train, please review in bulk. I shall commit them as separate changesets. Brief
> tour of changes:
> 
> *) alloc-seq-uint.patch: {first|last}_alloc_seq_num() are actually uint64_t, not size_t;
> *) hr-switches.patch: some compilers do not like switches that do not claim all enums;
> *) verifier-liveness.patch: some compilers do not like implicit size_t casts;
> *) for-loops.patch: some compilers do not like empty for-loop bodies;
> 
> Testing: hotspot_gc_shenandoah
> 
> Thanks,
> -Aleksey
> 
Looks good to me.