add llvm-loop

Signed-off-by: xiehuc <xiehuc@gmail.com>
update loop

Signed-off-by: xiehuc <xiehuc@gmail.com>
add dyn_cast to Instruction

Signed-off-by: xiehuc <xiehuc@gmail.com>
a value's content is where to assign it

Signed-off-by: xiehuc <xiehuc@gmail.com>
add getCanonicalEndCondition and pretty_print

Signed-off-by: xiehuc <xiehuc@gmail.com>
support llvm-3.4

Signed-off-by: xiehuc <xiehuc@gmail.com>
basic pretty_print

Signed-off-by: xiehuc <xiehuc@gmail.com>
add more pretty_print

Signed-off-by: xiehuc <xiehuc@gmail.com>
add unfinished latex_print

Signed-off-by: xiehuc <xiehuc@gmail.com>
clean code

Signed-off-by: xiehuc <xiehuc@gmail.com>