https://issues.dlang.org/show_bug.cgi?id=19197

          Issue ID: 19197
           Summary: Replace instances of typeid(T).getHash(..) with hashOf
           Product: D
           Version: D2
          Hardware: All
                OS: All
            Status: NEW
          Severity: enhancement
          Priority: P1
         Component: phobos
          Assignee: nobody@puremagic.com
          Reporter: petar.p.kirov@gmail.com

Since core.internal.hash.hashOf is a template, there are a number potential
benefits:
* better performance (e.g. more opportunities for inlining, less indirections
for value types)
* less dependence on TypeInfo (which we want to phase out in the long term)
* -betterC friendly (no need to link druntime and phobos to your library / app,
in order to use simple templates like std.typecons.Nullable)

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