[PATCH] CFE Knob for: Add a thread-model knob for lowering atomics on baremetal & single threaded systems

[Saleem Abdulrasool]

================
Comment at: lib/Driver/ToolChain.cpp:218
@@ +217,3 @@
+    return true;
+  else
+    return false;
----------------
The else here is superfluous.

http://reviews.llvm.org/D4985