#3359 Rematerialization of stack parameter addresses off by 2 when returning long long or struct

[Philipp Klaus Krause]

While working on struct parameters I ran into a preexisting stm8 codegen bug:

When a function return its value via a hidden pointer parameter (i.e. it return long long, struct, union or a _BitInt(N) with N > 8), rematerialization of on stack-addresses doesn't take into account the 2 byte offset from the hidden parameter.

[Philipp Klaus Krause]

Fixed in [r13262].