[PATCH] [compiler-rt] Use @rpath as LC_ID_DYLIB for ASan dylib on OS X

[Alexander Potapenko]

LGTM, but we probably want to hear Nick's opinion on this.

================
Comment at: tools/clang/lib/Driver/ToolChains.cpp:402
@@ -381,3 +401,3 @@
                           "libclang_rt.asan_osx_dynamic.dylib",
-                          true);
+                          true, false, true);
       } else {
----------------
Can you please comment which these bool constants stand for?
E.g. "/*AlwaysLink*/ true" etc.

http://reviews.llvm.org/D6018