[patch] Delete dead code in lib/ProfileData

[Rafael Espíndola]

A code review recently found a bug that in my patch in a change it
made to lib/ProfileData. I was surprised that no test found it. On a
closer look I realized the code was dead.

Normally I would just delete it, but since this is a fairly new
library this might have been just an oversight.

Is this something that should be in use by tools/llvm-profdata? If it
instead it is something that is intended for future use, it is
probably a good idea to delete it for now and bring it back when it is
actually used.

Cheers,
Rafael
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