[ORC] Rename ORC layers to make the "new" ORC layers the default.

This commit adds a 'Legacy' prefix to old ORC layers and utilities, and removes
the '2' suffix from the new ORC layers. If you wish to continue using the old
ORC layers you will need to add a 'Legacy' prefix to your classes. If you were
already using the new ORC layers you will need to drop the '2' suffix.

The legacy layers will remain in-tree until the new layers reach feature
parity with them. This will involve adding support for removing code from the
new layers, and ensuring that performance is comperable.

llvm-svn: 344572
diff --git a/llvm/lib/ExecutionEngine/Orc/LLJIT.cpp b/llvm/lib/ExecutionEngine/Orc/LLJIT.cpp
index 478ac2e..e464da2 100644
--- a/llvm/lib/ExecutionEngine/Orc/LLJIT.cpp
+++ b/llvm/lib/ExecutionEngine/Orc/LLJIT.cpp
@@ -21,7 +21,7 @@
       : llvm::orc::SimpleCompiler(*TM), TM(std::move(TM)) {}
   private:
     // FIXME: shared because std::functions (and thus
-    // IRCompileLayer2::CompileFunction) are not moveable.
+    // IRCompileLayer::CompileFunction) are not moveable.
     std::shared_ptr<llvm::TargetMachine> TM;
   };