Add #include <unistd.h> to OProfileWrapper.cpp. This provides the declarations for 'read' and 'close' that are otherwise missing, and result in 'error: <foo> was not declared in this scope'.
This matches the issue as reported in bug 15055 "Can no longer compile LLVM with --with-oprofile"
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@174661 91177308-0d34-0410-b5e6-96231b3b80d8
Also refactor the existing OProfile profiling code to reuse the same interfaces with the VTune profiling code.
In addition, unit tests for the profiling interfaces were added.
This patch was prepared by Andrew Kaylor and Daniel Malea, and reviewed in the llvm-commits list by Jim Grosbach
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@152620 91177308-0d34-0410-b5e6-96231b3b80d8
