Darwin read()/pread()/fread() and write()/pwrite()/fwrite() calls can only write INT_MAX bytes at a time.
Darwin read()/pread()/fread() and write()/pwrite()/fwrite() calls can only write INT_MAX bytes at a time.

Modify all read/write calls to allow any system to define MAX_READ_SIZE or MAX_WRITE_SIZE so large reads and writes can be divided up correctly.

<rdar://problem/20471411>



git-svn-id: 4c4cc70b1ef44ba2b7963015e681894188cea27e@234455 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,llvm-mirror/lldb,apple/swift-lldb,apple/swift-lldb,apple/swift-lldb,llvm-mirror/lldb,llvm-mirror/lldb