[Dotgnu-libjit] Function cannot return constant

[Alexey Galakhov]

Hello,

I found a bug that was just triggered by the constant folding but really
introduced in rev. 568424e (Restore the ability to allocate memory for
recompiled functions). If a function tries to return a constant like this

jit_value_t a = jit_value_create_nint_constant(func, jit_type_int, 2);
jit_insn_return(func, a);

an empty x86 code will be produced after compile. Previous versions
resulted in correct code. I haven't found the exact reason yet, sorry.
Can you please take a look?

Regards,
Alex