Added gdb-remote auxv test for chunked reads.

Verifies that a sum of offset,length auxv reads
matches a single large read, and that the auxv data
extracted from them match.


git-svn-id: https://llvm.org/svn/llvm-project/lldb/trunk@211127 91177308-0d34-0410-b5e6-96231b3b80d8