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Provides a list of instructions, which reference a function. A function "use" is an instruction in another (or the same) function which references the function. In most cases those are `function_ref` instructions, but can also be e.g. `keypath` instructions. 'FunctionUses' performs an analysis of all functions in the module and collects instructions which reference other functions. This utility can be used to do inter-procedural caller-analysis.