general list of actions required to perform the merge:
* Checkout recent GCC tree.
-* Run merge.sh script from libsanitizer directory. The script accepts one
- argument that is control version system (svn or git).
+* Run merge.sh script from libsanitizer directory.
* Modify Makefile.am files into asan/tsan/lsan/ubsan/sanitizer_common/interception
directories if needed. In particular, you may need to add new source files
and remove old ones in source files list, add new flags to {C, CXX}FLAGS if