reintroduce interval approx hints #525

Job	Run time
ubuntu-latest\|debug\|--enable-mcsat\|CC=gcc CXX=g++	9m 7s
ubuntu-latest\|debug\|--enable-mcsat\|CC=clang CXX=clang++	9m 20s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=gcc CXX=g++	4m 11s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=clang CXX=clang++	4m 50s
ubuntu-latest\|release\|--enable-mcsat\|CC=gcc CXX=g++	5m 48s
ubuntu-latest\|release\|--enable-mcsat\|CC=clang CXX=clang++	7m 6s
ubuntu-latest\|release\|--enable-thread-safety\|CC=gcc CXX=g++	3m 6s
ubuntu-latest\|release\|--enable-thread-safety\|CC=clang CXX=clang++	3m 11s
ubuntu-latest\|gcov\|--enable-mcsat\|CC=gcc CXX=g++	8m 22s
ubuntu-latest\|debug\|--enable-thread-safety --enable-mcsat\|CC=gcc CXX=g++	12m 26s
	1h 7m 27s

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