[PostOrderIterator] Use SmallVector to store stack; NFC
authorNikita Popov <nikita.ppv@gmail.com>
Sun, 29 Mar 2020 09:36:30 +0000 (11:36 +0200)
committerNikita Popov <nikita.ppv@gmail.com>
Sun, 29 Mar 2020 12:29:02 +0000 (14:29 +0200)
commit6ba63510720f5bd6033a3eeffd51f8d7e0e90432
treecf5936f31db121f8a41ec7b80d3575dc845826ad
parenta7115d51be09ebc8953a269d26bda3d0c50dbab2
[PostOrderIterator] Use SmallVector to store stack; NFC

We use a SmallPtrSet to track visited nodes, use a SmallVector
of the same size for the stack.
llvm/include/llvm/ADT/PostOrderIterator.h