Address two TODO notes in mert/evaluator.cpp.
Address two TODO notes in mert/evaluator.cpp.

The notes were about two objects which were created on the free store
using "new", then cleaned up using "delete".  May have been a Java
habit; the solution was as simple as creating them on the stack.

emjotde/mosesdecoder_nmt,KonceptGeek/mosesdecoder,emjotde/mosesdecoder_nmt,moses-smt/mosesdecoder,emjotde/mosesdecoder_nmt,pjwilliams/mosesdecoder,moses-smt/mosesdecoder,tofula/mosesdecoder,alvations/mosesdecoder,emjotde/mosesdecoder_nmt,alvations/mosesdecoder,moses-smt/mosesdecoder,KonceptGeek/mosesdecoder,tofula/mosesdecoder,emjotde/mosesdecoder_nmt,alvations/mosesdecoder,pjwilliams/mosesdecoder,moses-smt/mosesdecoder,KonceptGeek/mosesdecoder,tofula/mosesdecoder,emjotde/mosesdecoder_nmt,tofula/mosesdecoder,alvations/mosesdecoder,KonceptGeek/mosesdecoder,moses-smt/mosesdecoder,hychyc07/mosesdecoder,emjotde/mosesdecoder_nmt,moses-smt/mosesdecoder,KonceptGeek/mosesdecoder,alvations/mosesdecoder,alvations/mosesdecoder,pjwilliams/mosesdecoder,alvations/mosesdecoder,moses-smt/mosesdecoder,emjotde/mosesdecoder_nmt,pjwilliams/mosesdecoder,tofula/mosesdecoder,pjwilliams/mosesdecoder,moses-smt/mosesdecoder,emjotde/mosesdecoder_nmt,hychyc07/mosesdecoder,tofula/mosesdecoder,hychyc07/mosesdecoder,pjwilliams/mosesdecoder,KonceptGeek/mosesdecoder,pjwilliams/mosesdecoder,alvations/mosesdecoder,KonceptGeek/mosesdecoder,tofula/mosesdecoder,hychyc07/mosesdecoder,alvations/mosesdecoder,pjwilliams/mosesdecoder,moses-smt/mosesdecoder,moses-smt/mosesdecoder,KonceptGeek/mosesdecoder,moses-smt/mosesdecoder,hychyc07/mosesdecoder,tofula/mosesdecoder,tofula/mosesdecoder,hychyc07/mosesdecoder,hychyc07/mosesdecoder,pjwilliams/mosesdecoder,hychyc07/mosesdecoder,hychyc07/mosesdecoder,alvations/mosesdecoder,hychyc07/mosesdecoder,KonceptGeek/mosesdecoder,alvations/mosesdecoder,emjotde/mosesdecoder_nmt,pjwilliams/mosesdecoder,KonceptGeek/mosesdecoder,tofula/mosesdecoder,tofula/mosesdecoder