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[PGO]: Do not update Data->Value field during profile write.

Description

[PGO]: Do not update Data->Value field during profile write.

The profile reader no longer depends on this field to be updated and point
to owning func's vp data. The VP data also no longer needs to be allocated
in a contiguous memory space.

Differential Revision: http://reviews.llvm.org/D15258

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