[Orc] Move Orc code into a namespace (llvm::orc), update Kaleidoscope code.

NFC.

llvm-svn: 230143
diff --git a/llvm/lib/ExecutionEngine/Orc/IndirectionUtils.cpp b/llvm/lib/ExecutionEngine/Orc/IndirectionUtils.cpp
index 57616a5..11deb4a 100644
--- a/llvm/lib/ExecutionEngine/Orc/IndirectionUtils.cpp
+++ b/llvm/lib/ExecutionEngine/Orc/IndirectionUtils.cpp
@@ -8,6 +8,7 @@
 using namespace llvm;
 
 namespace llvm {
+namespace orc {
 
 GlobalVariable* createImplPointer(Function &F, const Twine &Name,
                                   Constant *Initializer) {
@@ -106,4 +107,5 @@
   return MP;
 }
 
-}
+} // End namespace orc.
+} // End namespace llvm.