Improved Integer handling in NRA plugin #519

Job	Run time
ubuntu-latest\|debug\|--enable-mcsat\|CC=gcc CXX=g++	2m 55s
ubuntu-latest\|debug\|--enable-mcsat\|CC=clang CXX=clang++	2m 58s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=gcc CXX=g++	2m 57s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=clang CXX=clang++	2m 57s
ubuntu-latest\|release\|--enable-mcsat\|CC=gcc CXX=g++	2m 56s
ubuntu-latest\|release\|--enable-mcsat\|CC=clang CXX=clang++	2m 50s
ubuntu-latest\|release\|--enable-thread-safety\|CC=gcc CXX=g++	2m 52s
ubuntu-latest\|release\|--enable-thread-safety\|CC=clang CXX=clang++	2m 56s
ubuntu-latest\|gcov\|--enable-mcsat\|CC=gcc CXX=g++	2m 52s
ubuntu-latest\|debug\|--enable-thread-safety --enable-mcsat\|CC=gcc CXX=g++	2m 42s
	28m 55s

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