5536 – Array append with dollar op on 64-bit

import std.stdio;
void main() {
 int[] as = [111, 666];
 writeln(as);
 as ~= as[$ - 2]; //!<- doesn't append 111 but the one right to it
 writeln(as);
 //! subtracting one more works correctly
 int[] bs = [111, 666];
 writeln(bs);
 bs ~= bs[$ - 3];
 writeln(bs);
 //! fetches memory outside of array
 int[] cs = [111];
 auto mem = *(&cs[0] + 1);
 writeln(cs);
 cs ~= cs[$ - 1];
 writeln(cs);
 assert(cs[1] == mem);
}
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!!! 64-bit specific error !!!
Assign appending using the dollar op fetches the wrong value.
Behaves as if the array length is updated before evaluating the dollar op.

https://github.com/D-Programming-Language/dmd/commit/f02795d86981f3b2560d4b1962dcea872daca484
https://github.com/D-Programming-Language/dmd/commit/835e7cfb6936bc796fa7857828dec5a07b2f604e