[ASan] Fix https://code.google.com/p/address-sanitizer/issues/detail?id=274
by ignoring globals from __TEXT,__cstring,cstring_literals during instrumenation.
Add a regression test.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203916 91177308-0d34-0410-b5e6-96231b3b80d8