openfimg: compiler: Treat undefined sources as dead operands

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
openfimg: compiler: Better handling of duplicate operands

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>
openfimg: compiler: Dump AST after second liveness pass

Signed-off-by: Tomasz Figa <tomasz.figa@gmail.com>