check cached value if it must be decided #515

Job	Run time
ubuntu-latest\|debug\|--enable-mcsat\|CC=gcc CXX=g++	8m 29s
ubuntu-latest\|debug\|--enable-mcsat\|CC=clang CXX=clang++	10m 2s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=gcc CXX=g++	4m 38s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=clang CXX=clang++	4m 49s
ubuntu-latest\|release\|--enable-mcsat\|CC=gcc CXX=g++	5m 40s
ubuntu-latest\|release\|--enable-mcsat\|CC=clang CXX=clang++	6m 11s
ubuntu-latest\|release\|--enable-thread-safety\|CC=gcc CXX=g++	2m 47s
ubuntu-latest\|release\|--enable-thread-safety\|CC=clang CXX=clang++	3m 34s
ubuntu-latest\|gcov\|--enable-mcsat\|CC=gcc CXX=g++	8m 27s
ubuntu-latest\|debug\|--enable-thread-safety --enable-mcsat\|CC=gcc CXX=g++	8m 38s
	1h 3m 15s

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