[llvm] [FinalizelSel] Re-scan the MachineFunction if we insert a new MBB by custom insertion (PR #96046)

[Craig Topper via llvm-commits]

topperc wrote:

I dug into this some more. The emitInstrWithCustomInsert dates back to a time when it was called from InstrEmitter.cpp as MachineInstrs were created from SelectionDAG. There was nothing later in the block. The MBB returned was used to reset the position for where future instructions should be inserted.

https://github.com/llvm/llvm-project/pull/96046