[Issue 19905] New: Floating point .init should be bitwise identical to .nan

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19905

          Issue ID: 19905
           Summary: Floating point .init should be bitwise identical to
                    .nan
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: minor
          Priority: P1
         Component: dmd
          Assignee: nobody at puremagic.com
          Reporter: iamthewilsonator at hotmail.com

see also https://github.com/dlang/dmd/pull/7568#discussion_r159835497

This makes the current `float is float` do something other than a bitwise
comparison.

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