[Issue 16680] dmd doesn't use druntime optimized versions of subtraction array operations

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=16680

--- Comment #6 from github-bugzilla at puremagic.com ---
Commit pushed to master at https://github.com/dlang/druntime

https://github.com/dlang/druntime/commit/184435f243b830cf464047deb1b636a8d5b4ed4a
implement templated array ops

- use RPN to encode operand precedence
- fixes Issue 15619, and 16680

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