[ThinLTO] Remove unused relative block frequency support (#177215) This removes most of the handling of the relative block frequency support added in 2018 in c73cec84c99e5a63dca961fef67998a677c53a3c, which was disabled by default and never utilized in the thin link as expected. Support for reading old Bitcode containing the record is maintained as required for backwards compatibility requirements, as is the support for parsing old LLVM assembly containing that information. Tests ensure that this backwards compatibility is maintained. This came up in the context of redundant BFI/DT computations which existed largely for the purpose of computing this information and are being addressed in PR176646.
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