https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81278
--- Comment #7 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Anyway, I've reproduced it on x86_64-linux with the unreduced testcase, trying to find which pass starts the differences on _ZNK4llvm12DenseMapBaseINS_8DenseMapIPNS_26DIGlobalVariableExpressionENS_6detail13DenseSetEmptyENS_10MDNodeInfoIS2_EENS4_12DenseSetPairIS3_EEEES3_S5_S7_S9_E15LookupBucketForIS3_EEbRKT_RPKS9_
