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from b47490c572c Fortran: generate error message for negative elements in SH [...] new b7561b5d244 libgcc: Add a backchain fallback to _Unwind_Backtrace() on PowerPC

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Summary of changes: .../gcc.target/powerpc/unwind-backchain.c | 24 +++++ libgcc/config/rs6000/linux-unwind.h | 102 ++++++++++++++++++--- libgcc/unwind.inc | 14 ++- 3 files changed, 124 insertions(+), 16 deletions(-) create mode 100644 gcc/testsuite/gcc.target/powerpc/unwind-backchain.c