[libFuzzer] Make dataflow and focus functions more user friendly.
Summary: - Fail loudly if SetFocusFunction failed when it should not. For more info see - https://github.com/google/oss-fuzz/issues/3311 - https://github.com/google/sanitizers/issues/1190 - Fail loudly if CollectDataFlow is called without seed corpus. Reviewers: kcc, metzman Subscribers: #sanitizers, llvm-commits Tags: #sanitizers, #llvm Differential Revision: https://reviews.llvm.org/D73813
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