Merge pull request #659 from ifilippov/master

patch for LLVM 3.3 and test correction at avx2
multiple targets in perf.py
fail_db.txt update on Linux with new passes
Merge pull request #660 from dbabokin/fail_db

fail_db.txt update on Linux with new passes
Fix task system dignostic to report real reason of the symaphore allocation fail
Fix for existing semaphore problem
Merge pull request #661 from dbabokin/task_diagnostics

Fix task system dignostic to report real reason of the symaphore allocat...
checking targets in perf.py
support of LLVM 3.5
Merge pull request #663 from ifilippov/perf

Adding multiple targets in perf.py
Merge pull request #664 from ifilippov/3_5

Support for LLVM 3.5
fix of perf.py