[ASan] Kill the remainders of platform defines in favor of SANITIZER_ defines

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@178629 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/asan/asan_linux.cc b/lib/asan/asan_linux.cc
index 7c7ab1e..148b5f0 100644
--- a/lib/asan/asan_linux.cc
+++ b/lib/asan/asan_linux.cc
@@ -134,4 +134,4 @@
 
 }  // namespace __asan
 
-#endif  // __linux__
+#endif  // SANITIZER_LINUX