[UBSan] Parse common runtime flags before using a symbolizer

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@201217 91177308-0d34-0410-b5e6-96231b3b80d8
[Sanitizer] Teach external symbolizer to work with addr2line if llvm-symbolizer is unavailable. Allow this mode in TSan.

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@201218 91177308-0d34-0410-b5e6-96231b3b80d8
[TSan] Kill tsan_symbolize_addr2line_linux.cc

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@201219 91177308-0d34-0410-b5e6-96231b3b80d8