[fuzzer] Read files as binary

Summary: Read corpus files as binary to avoid automatic conversions

Reviewers: Dor1s, morehouse

Reviewed By: Dor1s, morehouse

Differential Revision: https://reviews.llvm.org/D54180

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk/lib/fuzzer@346279 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed