Switch to HalideIR, with C API compile

.gitmodules

HalideIR

Makefile

include/tvm/array.h

include/tvm/base.h

include/tvm/domain.h

include/tvm/expr.h

include/tvm/expr_node.h

include/tvm/expr_util.h

include/tvm/op.h

include/tvm/stmt.h

include/tvm/stmt_node.h

src/c_api/c_api.cc

src/c_api/c_api_function.cc

src/c_api/c_api_registry.h

src/expr/domain.cc

src/expr/expr.cc

src/expr/expr_node.cc

src/expr/expr_util.cc

src/expr/op.cc