[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

llvm-svn: 346279
GitOrigin-RevId: 39b6ba9f3311854672fab754b6263c5db0bb9166
2 files changed