Wrap LLVMFuzzerTestOneInput

[jonathanmetzman]

Wrap LLVMFuzzerTestOneInput.

This can be used as a proof of concept for sampling. It may not work with all benchmarks such as bloaty. That is because some benchmarks depend on FUZZER_LIB being an actual library rather than CFLAGS.

An alternative approach is to use sed and awk to rewrite source files containing LLVMFuzzerTestOneInput.

[jonathanmetzman]

Wow looks like every standard benchmark builds with the wrapped LLVMFuzzerTestOneInput.