[MachineOutliner] NFC: Move EnableLinkOnceODROutlining into MachineOutliner.cpp

This moves the EnableLinkOnceODROutlining flag from TargetPassConfig.cpp into
MachineOutliner.cpp. It also removes OutlineFromLinkOnceODRs from the
MachineOutliner constructor. This is now handled by the moved command-line
flag.

llvm-svn: 330373
diff --git a/llvm/lib/CodeGen/TargetPassConfig.cpp b/llvm/lib/CodeGen/TargetPassConfig.cpp
index 0430172..46152aa 100644
--- a/llvm/lib/CodeGen/TargetPassConfig.cpp
+++ b/llvm/lib/CodeGen/TargetPassConfig.cpp
@@ -114,11 +114,6 @@
 static cl::opt<bool> EnableMachineOutliner("enable-machine-outliner",
     cl::Hidden,
     cl::desc("Enable machine outliner"));
-static cl::opt<bool> EnableLinkOnceODROutlining(
-    "enable-linkonceodr-outlining",
-    cl::Hidden,
-    cl::desc("Enable the machine outliner on linkonceodr functions"),
-    cl::init(false));
 // Enable or disable FastISel. Both options are needed, because
 // FastISel is enabled by default with -fast, and we wish to be
 // able to enable or disable fast-isel independently from -O0.
@@ -907,7 +902,7 @@
   addPass(&PatchableFunctionID, false);
 
   if (EnableMachineOutliner)
-    PM->add(createMachineOutlinerPass(EnableLinkOnceODROutlining));
+    addPass(createMachineOutlinerPass());
 
   // Add passes that directly emit MI after all other MI passes.
   addPreEmitPass2();