fix mcsat clause rescaling #510

Job	Run time
ubuntu-latest\|debug\|--enable-mcsat\|CC=gcc CXX=g++	8m 46s
ubuntu-latest\|debug\|--enable-mcsat\|CC=clang CXX=clang++	9m 12s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=gcc CXX=g++	4m 9s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=clang CXX=clang++	4m 26s
ubuntu-latest\|release\|--enable-mcsat\|CC=gcc CXX=g++	5m 58s
ubuntu-latest\|release\|--enable-mcsat\|CC=clang CXX=clang++	6m 6s
ubuntu-latest\|release\|--enable-thread-safety\|CC=gcc CXX=g++	2m 48s
ubuntu-latest\|release\|--enable-thread-safety\|CC=clang CXX=clang++	3m 46s
ubuntu-latest\|gcov\|--enable-mcsat\|CC=gcc CXX=g++	8m 47s
ubuntu-latest\|debug\|--enable-thread-safety --enable-mcsat\|CC=gcc CXX=g++	9m 3s
	1h 3m 1s

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