update on caches when setting model hints #521

Job	Run time
ubuntu-latest\|debug\|--enable-mcsat\|CC=gcc CXX=g++	6m 41s
ubuntu-latest\|debug\|--enable-mcsat\|CC=clang CXX=clang++	6m 46s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=gcc CXX=g++	4m 25s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=clang CXX=clang++	5m 19s
ubuntu-latest\|release\|--enable-mcsat\|CC=gcc CXX=g++	6m 24s
ubuntu-latest\|release\|--enable-mcsat\|CC=clang CXX=clang++	6m 41s
ubuntu-latest\|release\|--enable-thread-safety\|CC=gcc CXX=g++	3m 0s
ubuntu-latest\|release\|--enable-thread-safety\|CC=clang CXX=clang++	3m 13s
ubuntu-latest\|gcov\|--enable-mcsat\|CC=gcc CXX=g++	6m 42s
ubuntu-latest\|debug\|--enable-thread-safety --enable-mcsat\|CC=gcc CXX=g++	6m 41s
	55m 52s

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