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Fix for optimized clang 7 builds

Steffen Müthing requested to merge smuething/dune-alugrid:bugfix/fix-error-on-clang-7 into master

When building current ALUGrid with clang 7 in optimized mode (-O3), I get assertion errors during grid construction. I traced the problem down to the utility function cyclicReorder(), which contains a rather complicated expression that lacks intermediate sequence points. This seems to horribly trip up clang's optimizer.

Fixed by splitting the offending expression into separate statements.

Closes #50 (closed)

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