Add CMake build support for Orc examples (& fix some clang -Werror build
breaks due to unused variables).

llvm-svn: 228520
diff --git a/llvm/examples/Kaleidoscope/Orc/initial/toy.cpp b/llvm/examples/Kaleidoscope/Orc/initial/toy.cpp
index ce9fc7f..d068394 100644
--- a/llvm/examples/Kaleidoscope/Orc/initial/toy.cpp
+++ b/llvm/examples/Kaleidoscope/Orc/initial/toy.cpp
@@ -1,3 +1,4 @@
+
 #include "llvm/Analysis/Passes.h"
 #include "llvm/ExecutionEngine/Orc/CompileUtils.h"
 #include "llvm/ExecutionEngine/Orc/IRCompileLayer.h"
@@ -1294,7 +1295,6 @@
   InitializeNativeTarget();
   InitializeNativeTargetAsmPrinter();
   InitializeNativeTargetAsmParser();
-  LLVMContext &Context = getGlobalContext();
 
   // Install standard binary operators.
   // 1 is lowest precedence.