[ASan] Do not imply -undefined dynamic_lookup when linking dylibs with -fsanitize=address.
Instead add the ASan runtime to the linker command line so that only the ASan API functions can be undefined in the target library.

Fixes http://llvm.org/bugs/show_bug.cgi?id=17275



git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@191076 91177308-0d34-0410-b5e6-96231b3b80d8
[ASan] Fix darwin-sanitizer-ld.c to test for the new order of linker flags introduced by r191076.


git-svn-id: http://llvm.org/svn/llvm-project/cfe/trunk@191077 91177308-0d34-0410-b5e6-96231b3b80d8