codegen: export all ABIs that we refer to in codegen (#57083)

Since codegen may refer to these, it helps to have the linker able to
resolve them, if that case ever happens.

Fixes #56701

src/gf.c

@@ -3034,19 +3034,19 @@ jl_code_instance_t *jl_compile_method_internal(jl_method_instance_t *mi, size_t
     return codeinst;
 }
 
-jl_value_t *jl_fptr_const_return(jl_value_t *f, jl_value_t **args, uint32_t nargs, jl_code_instance_t *m)
+JL_DLLEXPORT jl_value_t *jl_fptr_const_return(jl_value_t *f, jl_value_t **args, uint32_t nargs, jl_code_instance_t *m)
 {
     return m->rettype_const;
 }
 
-jl_value_t *jl_fptr_args(jl_value_t *f, jl_value_t **args, uint32_t nargs, jl_code_instance_t *m)
+JL_DLLEXPORT jl_value_t *jl_fptr_args(jl_value_t *f, jl_value_t **args, uint32_t nargs, jl_code_instance_t *m)
 {
     jl_fptr_args_t invoke = jl_atomic_load_relaxed(&m->specptr.fptr1);
     assert(invoke && "Forgot to set specptr for jl_fptr_args!");
     return invoke(f, args, nargs);
 }
 
-jl_value_t *jl_fptr_sparam(jl_value_t *f, jl_value_t **args, uint32_t nargs, jl_code_instance_t *m)
+JL_DLLEXPORT jl_value_t *jl_fptr_sparam(jl_value_t *f, jl_value_t **args, uint32_t nargs, jl_code_instance_t *m)
 {
     jl_svec_t *sparams = jl_get_ci_mi(m)->sparam_vals;
     assert(sparams != jl_emptysvec);