[Issue 19902] New: hasElaborateCopyConstructor doesn't know about copy constructors

[d-bugmail at puremagic.com]

https://issues.dlang.org/show_bug.cgi?id=19902

          Issue ID: 19902
           Summary: hasElaborateCopyConstructor doesn't know about copy
                    constructors
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: regression
          Priority: P1
         Component: phobos
          Assignee: nobody at puremagic.com
          Reporter: turkeyman at gmail.com

`hasElaborateCopyConstructor` in phobos (and also in druntime:
core.internal.traits) needs to be updated to understand copy constructors.

There may be some others that need tweaking too?

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