reintroduce interval approx hints #524

Job	Run time
ubuntu-latest\|debug\|--enable-mcsat\|CC=gcc CXX=g++	8m 42s
ubuntu-latest\|debug\|--enable-mcsat\|CC=clang CXX=clang++	9m 55s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=gcc CXX=g++	4m 19s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=clang CXX=clang++	4m 49s
ubuntu-latest\|release\|--enable-mcsat\|CC=gcc CXX=g++	5m 42s
ubuntu-latest\|release\|--enable-mcsat\|CC=clang CXX=clang++	6m 30s
ubuntu-latest\|release\|--enable-thread-safety\|CC=gcc CXX=g++	2m 44s
ubuntu-latest\|release\|--enable-thread-safety\|CC=clang CXX=clang++	3m 14s
ubuntu-latest\|gcov\|--enable-mcsat\|CC=gcc CXX=g++	8m 25s
ubuntu-latest\|debug\|--enable-thread-safety --enable-mcsat\|CC=gcc CXX=g++	8m 47s
	1h 3m 7s

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