[Issue 12891] New: add atomicInc and atomicDec to core.atomic

[via Digitalmars-d-bugs]

https://issues.dlang.org/show_bug.cgi?id=12891

          Issue ID: 12891
           Summary: add atomicInc and atomicDec to core.atomic
           Product: D
           Version: unspecified
          Hardware: x86_64
                OS: Linux
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: druntime
          Assignee: nobody at puremagic.com
          Reporter: code at dawg.eu

At least on the X86 architecture atomic increments/decrements can be done way
more efficient using specialized instruction which are not used by the more
generic atomicOp.

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