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cee5b6cc82
After having committed https://reviews.llvm.org/D72226, 2 buildbots running GCC 5.4.0 began failing. The cause was the order in which those compilers evaluated the left- and right-hand sides of the expression `RC.SCCIndices[C] = RC.SCCIndices.size();`. This commit splits the expression into multiple statements to avoid ambiguity, and adds a test case that exercises the code that caused the test failures on those older compilers (which was originally included in the reviewed patch, https://reviews.llvm.org/D72226).