[libFuzzer] Allow non-fuzzer args after -ignore_remaining_args=1

[libFuzzer] Allow non-fuzzer args after -ignore_remaining_args=1

With this change, libFuzzer will ignore any arguments after a sigil
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 -ignore_remaining_args=1 in
LLVMFuzzerInitialize.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@308069 91177308-0d34-0410-b5e6-96231b3b80d8