Add loaditype to covergen
Created by: quswarabid
compilable tests generating for loaditypes[lb, lh, lw, ld, lbu, lhu, lwu]
cd $WALLY/tests/testgen && make
cd $WALLY && run-elf-cov.bash --seed sim/questa/seed0.txt --verbose --coverdb sim/questa/functcov/add.ucdb --elf ${WALLY}/tests/functcov/rv64/I/WALLY-COV-lwu.elf