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misc fixes from cpp-ethereum repo. #110
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This improves performance using 512bit SIMD instructions.
Fixes #4115.
It looks like older versions of GCC have slightly unreliable logic for array out-of-bounds detection. Code in ethash which uses unions and arrays is firing a warning in both Debian Jesse (8.5) and in the ARM Linux cross-builds. Debian Jesse uses GCC 4.9.2. The cross-builds are using GCC 4.8.4. Other distros are using GCC 5.x or even GCC 6.x (Arch). The issue is https://gcc.gnu.org/bugzilla/show_bug.cgi?id=56273 and was fixed in GCC 5.0 and backported to 4.9.3. Updated comments.
With this change we will be able to remove a global warning suppression from our CMake files.
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misc
libethashfixes from https://github.com/ethereum/aleth/commits/ec23ff4a5 branch point