Improved Integer handling in NRA plugin #520

Job	Run time
ubuntu-latest\|debug\|--enable-mcsat\|CC=gcc CXX=g++	8m 52s
ubuntu-latest\|debug\|--enable-mcsat\|CC=clang CXX=clang++	10m 11s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=gcc CXX=g++	4m 11s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=clang CXX=clang++	5m 3s
ubuntu-latest\|release\|--enable-mcsat\|CC=gcc CXX=g++	6m 14s
ubuntu-latest\|release\|--enable-mcsat\|CC=clang CXX=clang++	6m 19s
ubuntu-latest\|release\|--enable-thread-safety\|CC=gcc CXX=g++	2m 50s
ubuntu-latest\|release\|--enable-thread-safety\|CC=clang CXX=clang++	3m 16s
ubuntu-latest\|gcov\|--enable-mcsat\|CC=gcc CXX=g++	8m 38s
ubuntu-latest\|debug\|--enable-thread-safety --enable-mcsat\|CC=gcc CXX=g++	9m 1s
	1h 4m 35s

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