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[Diego Novillo]

This patch adds a new command 'convert' to tools/llvm-profdata.
The conversion takes three basic arguments: profile file, ELF
binary and the name of the output LLVM sample profile:

$ llvm-profdata convert --type=perf --binary=a.out -o profile.llvm perf.data

Other sample profilers can be specified with --type. Right now,
we only support Linux Perf.

If anyone is interested in adding other profilers, please let me
know. It will be very helpful to me in the process of
generalizing the current implementation, which is naturally tied
to Linux Perf.


Diego.
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