#3307 Compiler crash in DS390 port

[Gabriele Gorla]

SDCC [12878] crashes when running newly added reentrant.c regression test on ds390

gen/ds390/reentrant/reentrant_type_signed_long_long.c:14: error 9: FATAL Compiler Internal Error in file 'gen.c' line number '3878' : sym->recvSize <= 4
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Issue only affects long long test (both signed and unsigned)