fix mcsat clause rescaling #511

Job	Run time
ubuntu-latest\|debug\|--enable-mcsat\|CC=gcc CXX=g++	8m 45s
ubuntu-latest\|debug\|--enable-mcsat\|CC=clang CXX=clang++	9m 58s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=gcc CXX=g++	4m 10s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=clang CXX=clang++	4m 46s
ubuntu-latest\|release\|--enable-mcsat\|CC=gcc CXX=g++	6m 11s
ubuntu-latest\|release\|--enable-mcsat\|CC=clang CXX=clang++	6m 25s
ubuntu-latest\|release\|--enable-thread-safety\|CC=gcc CXX=g++	2m 50s
ubuntu-latest\|release\|--enable-thread-safety\|CC=clang CXX=clang++	3m 32s
ubuntu-latest\|gcov\|--enable-mcsat\|CC=gcc CXX=g++	8m 25s
ubuntu-latest\|debug\|--enable-thread-safety --enable-mcsat\|CC=gcc CXX=g++	8m 30s
	1h 3m 32s

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