ADT: Split ilist_node_traits into alloc and callback, NFC

Many lists want to override only allocation semantics, or callbacks for
iplist.  Split these up to prevent code duplication.
- Specialize ilist_alloc_traits to change the implementations of
  deleteNode() and createNode().
- One common desire is to do nothing deleteNode() and disable
  createNode().  Specialize ilist_alloc_traits to inherit from
  ilist_noalloc_traits for that behaviour.
- Specialize ilist_callback_traits to use the addNodeToList(),
  removeNodeFromList(), and transferNodesFromList() callbacks.

As a drive-by, add some coverage to the callback-related unit tests.

llvm-svn: 280128

1 files changed, 1 insertions, 1 deletions

diff --git a/llvm/lib/CodeGen/MachineFunction.cpp b/llvm/lib/CodeGen/MachineFunction.cpp
index c8039f5e876..7f1bb9294ad 100644
--- a/llvm/lib/CodeGen/MachineFunction.cpp
+++ b/llvm/lib/CodeGen/MachineFunction.cpp
@@ -86,7 +86,7 @@ void MachineFunctionProperties::print(raw_ostream &OS) const {
 // Out-of-line virtual method.
 MachineFunctionInfo::~MachineFunctionInfo() {}
 
-void ilist_traits<MachineBasicBlock>::deleteNode(MachineBasicBlock *MBB) {
+void ilist_alloc_traits<MachineBasicBlock>::deleteNode(MachineBasicBlock *MBB) {
   MBB->getParent()->DeleteMachineBasicBlock(MBB);
 }