[PGO] Convert InstrProfRecord based serialization methods to use common C methods

[PGO] Convert InstrProfRecord based serialization methods to use common C methods

1. Convert serialization methods using InstrProfRecord as source into C (impl)
   interfaces using Closure.
2. Reimplement InstrProfRecord serialization method to use new C interface
   as dummy wrapper.

Now it is ready to implement wrapper for runtime value profile data.

(The new code need better source location -- but not changed in this patch to
 minimize diffs. )

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@254057 91177308-0d34-0410-b5e6-96231b3b80d8