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c479bc7f3b
This allows coverage information to be attached to the function as a whole when appropriate, instead of being smuggled through coverage statements in the function's basic blocks. As an example, this patch moves the `function_source_hash` value out of individual `CoverageKind::Counter` statements and into the per-function info. When synthesizing unused functions for coverage purposes, the absence of this info is taken to indicate that a function was not eligible for coverage and should not be synthesized.