fix mcsat clause rescaling (#530) #512

Job	Run time
ubuntu-latest\|debug\|--enable-mcsat\|CC=gcc CXX=g++	9m 2s
ubuntu-latest\|debug\|--enable-mcsat\|CC=clang CXX=clang++	9m 29s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=gcc CXX=g++	4m 31s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=clang CXX=clang++	5m 1s
ubuntu-latest\|release\|--enable-mcsat\|CC=gcc CXX=g++	5m 45s
ubuntu-latest\|release\|--enable-mcsat\|CC=clang CXX=clang++	6m 16s
ubuntu-latest\|release\|--enable-thread-safety\|CC=gcc CXX=g++	3m 6s
ubuntu-latest\|release\|--enable-thread-safety\|CC=clang CXX=clang++	3m 23s
ubuntu-latest\|gcov\|--enable-mcsat\|CC=gcc CXX=g++	8m 38s
ubuntu-latest\|debug\|--enable-thread-safety --enable-mcsat\|CC=gcc CXX=g++	8m 56s
	1h 4m 7s

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