[llvm] [Profile] Use upper 32 bits of profile version for profile variants. (PR #67695)

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xur-llvm wrote:

I'm also fine with using more bits for profile variants information. 32 bits seem a lot as of now. But we don't need that many bits for versions. So 32-bit is fine with me.


https://github.com/llvm/llvm-project/pull/67695