[refactor] Enable the new ast builder by default

[lin-hitonami]

issue = #3038

When fixing pylint R1705 no-else-return, some of the raise statements are moved outside the else scope of the static-if, resulting raising errors when traversing to the Raise node. For example:

    if ti.static(A.n == 2): 
        ret = svd2d(A, dt)
        return ret
    elif ti.static(A.n == 3):
        return svd3d(A, dt)
    else:
        raise Exception("SVD only supports 2D and 3D matrices.")

was changed to

    if ti.static(A.n == 2):
        ret = svd2d(A, dt)
        return ret
    if ti.static(A.n == 3):
        return svd3d(A, dt)
    raise Exception("SVD only supports 2D and 3D matrices.")

and the AST builder will continue to visit the Raise node because it is not in the else branch of static-if.
Immediate termination of traversing when meeting return statement can be supported in the future.

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[g1n0st]

Thanks!

[ailzhang]

Thanks!

[strongoier]

Thanks!