Merge pull request #173 from dillonhuff/AST_if

fix a typo for merge domain dim while refactor code

local update for git bisect

cgra flow pass

all tests pass

all test pass with new refactoed DNN scheduler

create vanilla DNN schedule should work for all applications

fix a type in build schedule expr

resnet app works with loop perfection, dhuff/lake tests pass

loop perfection implemented and first test pass, schedule II need to be tighten again

add a if ir node and work with coarse grained schedule, need run regression

Directly included barvinok 0.41

all tests pass

refactor the code, move generate code from prog.cpp into codegen.cpp

Merge branch 'master' into glb