also enable nra learning when using interpolation mode #409

Job	Run time
ubuntu-latest\|debug\|--enable-mcsat\|CC=gcc CXX=g++	8m 24s
ubuntu-latest\|debug\|--enable-mcsat\|CC=clang CXX=clang++	8m 58s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=gcc CXX=g++	3m 45s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=clang CXX=clang++	4m 14s
ubuntu-latest\|release\|--enable-mcsat\|CC=gcc CXX=g++	5m 21s
ubuntu-latest\|release\|--enable-mcsat\|CC=clang CXX=clang++	5m 43s
ubuntu-latest\|release\|--enable-thread-safety\|CC=gcc CXX=g++	2m 25s
ubuntu-latest\|release\|--enable-thread-safety\|CC=clang CXX=clang++	2m 36s
ubuntu-latest\|gcov\|--enable-mcsat\|CC=gcc CXX=g++	7m 59s
ubuntu-latest\|debug\|--enable-thread-safety --enable-mcsat\|CC=gcc CXX=g++	8m 5s
	57m 30s

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