[PATCH, PR48461] define emit_use_return_register_into_block only if HAVE_return.

[Tom de Vries]

Hi,

I introduced the function emit_use_return_register_into_block for
PR43920, but should have guarded it with HAVE_return.
The patch fixes this.

Tested by doing x86_64 non-bootstrap c/fortran build.

OK for trunk?

Thanks,
- Tom
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