[LCG] Remove a dead declaration. This stopped being used when I switched
to a more normal move operation on the graph itself. The definition
already got removed, but I missed the declaration.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@206455 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed