GCC 4.6/4.7 vs. LLVM-Clang 3.0/3.1 Compilers

This testing was done from an Intel Sandy Bridge platform in late April while new Intel Ivy Bridge compiler benchmarks and other results are due out soon. There's also some AMD FX-8150 Bulldozer compiler benchmarks and some other earlier Clang 3.1 results.
Aside from GCC 4.6.3, GCC 4.7.0, LLVM-Clang 3.0, and LLVM-Clang 3.1 SVN, AMD's Open64 5.0 x86_64 compiler was tossed into the mix. However, for the Intel Sandy Bridge platform and the set of open-source test profiles used, AMD's Open64 flavor only ended up working for a single test profile.
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