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from 04bb15e48ef [gdb/build] Fix build breaker with --enable-shared new a262f969d6f tree-optimization/106866 - avoid dead abnormal edges from DCE new 7abcdb06e31 Restore XCOFF for DWARF on AIX.

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Summary of changes: gcc/collect2.cc | 7 +++ gcc/config/rs6000/rs6000.cc | 6 ++ gcc/config/rs6000/xcoff.h | 3 + gcc/dwarf2asm.cc | 13 ++++- gcc/dwarf2out.cc | 103 +++++++++++++++++++++++---------- gcc/testsuite/gcc.dg/uninit-pr106866.c | 38 ++++++++++++ gcc/tree-ssa-dce.cc | 48 ++++++++++++--- 7 files changed, 176 insertions(+), 42 deletions(-) create mode 100644 gcc/testsuite/gcc.dg/uninit-pr106866.c