[sanitizer] move write/pwrite/pwrite64 interceptors to common

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@172722 91177308-0d34-0410-b5e6-96231b3b80d8
[asan] restructure read/pread/pread64 tests

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@172723 91177308-0d34-0410-b5e6-96231b3b80d8