Remove non-DebugLoc forms of CopyToReg and CopyFromReg.
Adjust callers.

llvm-svn: 63789
diff --git a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
index 537b704..32f6935 100644
--- a/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
+++ b/llvm/lib/CodeGen/SelectionDAG/SelectionDAG.cpp
@@ -4386,7 +4386,7 @@
 ///
 /// Note that MorphNodeTo returns the resultant node.  If there is already a
 /// node of the specified opcode and operands, it returns that node instead of
-/// the current one.
+/// the current one.  Note that the DebugLoc need not be the same.
 ///
 /// Using MorphNodeTo is faster than creating a new node and swapping it in
 /// with ReplaceAllUsesWith both because it often avoids allocating a new