hints for reals (#516) #459

Job	Run time
ubuntu-latest\|debug\|--enable-mcsat\|CC=gcc CXX=g++	8m 11s
ubuntu-latest\|debug\|--enable-mcsat\|CC=clang CXX=clang++	8m 32s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=gcc CXX=g++	4m 3s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=clang CXX=clang++	4m 23s
ubuntu-latest\|release\|--enable-mcsat\|CC=gcc CXX=g++	5m 30s
ubuntu-latest\|release\|--enable-mcsat\|CC=clang CXX=clang++	5m 27s
ubuntu-latest\|release\|--enable-thread-safety\|CC=gcc CXX=g++	2m 27s
ubuntu-latest\|release\|--enable-thread-safety\|CC=clang CXX=clang++	2m 56s
ubuntu-latest\|gcov\|--enable-mcsat\|CC=gcc CXX=g++	7m 59s
ubuntu-latest\|debug\|--enable-thread-safety --enable-mcsat\|CC=gcc CXX=g++	8m 27s
	57m 55s

Provide feedback