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This changes code emission such that it can emit specific function fragments instead of scanning all basic blocks of a function and just emitting those that are hot or cold. To implement this, `FunctionLayout` explicitly distinguishes the "main" fragment (i.e. the one that contains the entry block and is associated with the original symbol) from "split" fragments. Additionally, `BinaryFunction` receives support for multiple cold symbols - one for each split fragment. Reviewed By: rafauler Differential Revision: https://reviews.llvm.org/D130052