[cc65] optimization bug

Hi!
With optimizations enabled, the assert below trigs with revision 4037
and head. Passes with 4036.

Cheers
Johan
-----------

#include <assert.h>

char* ptr1 = (char*)0x3000;
char ptr2[1];
char offs;

void main() {
    *(char*)0x3000 = 4;
    assert(4 == ptr1[ptr2[offs]]);
}
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