[PATCH] D15306: [llvm-profdata] Add support for weighted merge of profile data (2nd try)

[Nathan Slingerland via llvm-commits]

Thanks.

I had to change the check a bit because there is the case where the user
(especially a first time user) might try to specify a non-integer weight.
For example, 0.75.

​I'll add that and tests to cover the cases discussed in the next revision.
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