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Work around a nasty compiler bug in GCC 6.3

Steffen Müthing requested to merge bug/workaround-for-gcc-6-3-bug-in-bitsetvector into master

GCC 6.3 errors out with an ICE or simply hangs when instantiating a certain variant of operator^= on BitSetVectorReference. This patch works around the problem by forcing the actual XOR instruction into a separate function for that compiler. The workaround is probably horribly slow, but it shouldn't have any impact on unaffected compilers.

This probably needs backporting.

Edited by Steffen Müthing

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