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from 6a9a8e156cc [RS6000] libgcc cfi new 968bbc892e5 [libbacktrace] Avoid realloc with size == 0 in backtrace_ve [...] new cc0ff4df2d9 [libbacktrace] Don't point to released memory in backtrace_ [...]

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Summary of changes: libbacktrace/ChangeLog | 13 ++++++ libbacktrace/Makefile.am | 4 ++ libbacktrace/Makefile.in | 25 ++++++++-- libbacktrace/alloc.c | 13 +++++- libbacktrace/mmap.c | 2 + libbacktrace/{state.c => unittest.c} | 88 ++++++++++++++++++++++-------------- 6 files changed, 106 insertions(+), 39 deletions(-) copy libbacktrace/{state.c => unittest.c} (57%)