[PATCH] Support for separate debug info files in asan symbolize script

[Maria Guseva]

Hi glider, samsonov, kcc,

The patch allows asan symbolize script to use separate debug info files on Linux system using ELF debug link or build ID for debug info files locating. These are methods provided currently by GNU Binutils. Added functionality replicates the GDB algorithm https://sourceware.org/gdb/onlinedocs/gdb/Separate-Debug-Files.html

http://reviews.llvm.org/D4902

Files:
  lib/asan/scripts/asan_symbolize.py
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