Mcsat arrays fixes (#499) #357

Job	Run time
ubuntu-latest\|debug\|--enable-mcsat\|CC=gcc CXX=g++	8m 10s
ubuntu-latest\|debug\|--enable-mcsat\|CC=clang CXX=clang++	8m 50s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=gcc CXX=g++	3m 45s
ubuntu-latest\|debug\|--enable-thread-safety\|CC=clang CXX=clang++	4m 15s
ubuntu-latest\|release\|--enable-mcsat\|CC=gcc CXX=g++	5m 40s
ubuntu-latest\|release\|--enable-mcsat\|CC=clang CXX=clang++	5m 12s
ubuntu-latest\|release\|--enable-thread-safety\|CC=gcc CXX=g++	2m 24s
ubuntu-latest\|release\|--enable-thread-safety\|CC=clang CXX=clang++	2m 31s
ubuntu-latest\|gcov\|--enable-mcsat\|CC=gcc CXX=g++	8m 42s
ubuntu-latest\|debug\|--enable-thread-safety --enable-mcsat\|CC=gcc CXX=g++	8m 7s
	57m 36s

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