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

NFC.

llvm-svn: 230143
diff --git a/llvm/lib/ExecutionEngine/Orc/OrcTargetSupport.cpp b/llvm/lib/ExecutionEngine/Orc/OrcTargetSupport.cpp
index e71fc65..b5dda8e 100644
--- a/llvm/lib/ExecutionEngine/Orc/OrcTargetSupport.cpp
+++ b/llvm/lib/ExecutionEngine/Orc/OrcTargetSupport.cpp
@@ -2,7 +2,7 @@
 #include "llvm/ExecutionEngine/Orc/OrcTargetSupport.h"
 #include <array>
 
-using namespace llvm;
+using namespace llvm::orc;
 
 namespace {
 
@@ -47,6 +47,7 @@
 }
 
 namespace llvm {
+namespace orc {
 
 const char* OrcX86_64::ResolverBlockName = "orc_resolver_block";
 
@@ -123,4 +124,5 @@
   return GetLabelName;
 }
 
-}
+} // End namespace orc.
+} // End namespace llvm.