[DFSan] Add custom wrapper for getpeername.

The wrapper clears shadow for addr and addrlen when written to.

Reviewed By: stephan.yichao.zhao

Differential Revision: https://reviews.llvm.org/D93046

GitOrigin-RevId: fa4bd4b338d1c8c0a95b63b13640b10694b8185c
3 files changed