check cached value if it must be decided (#531) #516

Job	Run time
ubuntu-latest\|debug\|--enable-mcsat\|CC=gcc CXX=g++	8m 28s
ubuntu-latest\|debug\|--enable-mcsat\|CC=clang CXX=clang++	9m 47s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=gcc CXX=g++	4m 17s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=clang CXX=clang++	5m 2s
ubuntu-latest\|release\|--enable-mcsat\|CC=gcc CXX=g++	5m 36s
ubuntu-latest\|release\|--enable-mcsat\|CC=clang CXX=clang++	6m 20s
ubuntu-latest\|release\|--enable-thread-safety\|CC=gcc CXX=g++	2m 45s
ubuntu-latest\|release\|--enable-thread-safety\|CC=clang CXX=clang++	3m 13s
ubuntu-latest\|gcov\|--enable-mcsat\|CC=gcc CXX=g++	8m 47s
ubuntu-latest\|debug\|--enable-thread-safety --enable-mcsat\|CC=gcc CXX=g++	8m 40s
	1h 2m 55s

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