[Bug modula2/108183] wrong code generated in the modula2 scaffold mechanism

["iains at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108183

--- Comment #12 from Iain Sandoe <iains at gcc dot gnu.org> ---
With the change above (and adding an assert that the function is not
defined/implemented) -- NOTE: plus a number of other hacks to workaround other
PRs in progress ... we now have something more reasonable for m32 darwin.

test time is large - primarily because a significant number of the fails are
timeouts.


=== x86-64 Darwin with a 32b multilib.

                === gm2 Summary for unix/-m32 ===

# of expected passes            11820
# of unexpected failures        48

                === gm2 Summary for unix/-m64 ===

# of expected passes            11818
# of unexpected failures        50

                === gm2 Summary ===

# of expected passes            23638
# of unexpected failures        98

Compiler version: gcc gm2 
Platform: x86_64-apple-darwin17

==== i686-darwin with a 64b multilib.

                === gm2 Summary for unix/-m32 ===

# of expected passes            11833
# of unexpected failures        35

                === gm2 Summary for unix/-m64 ===

# of expected passes            12957
# of unexpected failures        63

                === gm2 Summary ===

# of expected passes            24790
# of unexpected failures        98

Compiler version: gcc gm2 
Platform: i686-apple-darwin9

===== powerpc-darwin

                === gm2 Summary for unix/-m32 ===

# of expected passes            11817
# of unexpected failures        51

                === gm2 Summary for unix/-m32 ===

# of expected passes            11817
# of unexpected failures        51