support for a class of circular references

ChangeLog

libasn1compiler/asn1c_C.c

libasn1compiler/asn1c_misc.c

libasn1compiler/asn1c_misc.h

libasn1compiler/asn1c_out.c

libasn1compiler/asn1c_out.h

libasn1compiler/asn1c_save.c

libasn1compiler/asn1compiler.c

libasn1parser/asn1p_expr.h

tests/19-param-OK.asn1.-P

tests/30-set-OK.asn1.-P

tests/31-set-of-OK.asn1.-P

tests/32-sequence-of-OK.asn1.-P

tests/39-sequence-of-OK.asn1.-P

tests/42-real-life-OK.asn1.-PR

tests/43-recursion-OK.asn1.-P

tests/44-choice-in-sequence-OK.asn1.-P

tests/46-redefine-OK.asn1.-PR

tests/47-set-ext-OK.asn1.-P

tests/50-constraint-OK.asn1.-P