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

NFC.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@230143 91177308-0d34-0410-b5e6-96231b3b80d8

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 @@ FullyPartitionedModule fullyPartition(Module &M) {
   return MP;
 }
 
-}
+} // End namespace orc.
+} // End namespace llvm.