[Issue 19199] New: Use core.bitops intrinsics during CTFE

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19199

          Issue ID: 19199
           Summary: Use core.bitops intrinsics during CTFE
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: n8sh.secondary at hotmail.com

Currently in `dmd.builtin` there are software implementations of `core.bitop`
functions within `eval_bsf`, `eval_bsr`, `eval_bswap`, and `eval_popcnt`. With
DMD written in D this is unnecessary: they can use `core.bitop`.

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