Wladimir J. van der Laan b7c8812ad0
Merge #12564: [arith_uint256] Avoid unnecessary this-copy using prefix operator
22b4aae02 [arith_uint256] Avoid unnecessary this-copy using prefix operator (Karl-Johan Alm)

Pull request description:

  I noticed while profiling a related project that `operator-()` actually calls the `base_uint` constructor, which is because the postfix operator version of `operator++` (used in `operator-()`) creates a copy of `this` and returns it.

Tree-SHA512: d9a2665caa3d93f064cdeaf1c6fada101b9943bb53d93ccac6d9a0edac20279d2e921349e30239039c71e0a9629e45c29ec9f10d8d7499e936cdba6cb7c3c3eb
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