GCC 6.1 vs. LLVM Clang 3.9 Compiler Performance

After carrying out the recent GCC 4.9 vs. 5.3 vs. 6.1 compiler benchmarks for looking at the GNU Compiler Collection performance over the past three years on the same Linux x86_64 system, I then loaded up a development snapshot of the LLVM 3.9 SVN compiler to see how these two dominant compilers are competing on the performance front for C/C++ programs.