[asan] Mac: do not link dynamic libs with the asan-rt, use -undefined dynamic_lookup for dynamic libs. Style fixes. Patch by glider@google.com 

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@145955 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed