[PATCH] [libFuzzer] Allow non-fuzzer args after "--"

[Justin Bogner via llvm-commits]

With this change, libFuzzer will ignore any arguments after an empty
double dash argument, but it will preserve these arguments at the end
of the command line when launching subprocesses. Using this, its
possible to handle positional and single-dash arguments to the program
under test by discarding everything up to "--" in LLVMFuzzerInitialize.

The motivation here is in trying to set up fuzzers that use the LLVM
backend, for example so that we can pass "-global-isel" in an ISel
fuzzer to test that instead of SelectionDAG.

Ok to commit?

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