#2788 An unsigned long long arithmetic test from GCC fails for ds390

[Philipp Klaus Krause]

In [r10486], an arithmetic test from GCC 8.2 was added to the SDCC regression tests.
The test has multiple parts - the signed long long part fails for all backends except mcs51. The unsigned long long part passes for most backends, but fails for ds390 and hc08/s08. This bug report is about ds390
To reproduce, remove the preprocessor guard in tests/gcc-torture-execute-arith-rand-ll.c.

Philipp

[Erik Petrich]

Same root cause as [#2702] and likewise fixed by [r11119]