Factor Node creation out of the demangler. No functionality change intended.
Factor Node creation out of the demangler. No functionality change intended.

(This is a port of llvm r339944 to libcxxabi.)


git-svn-id: 6a9f6578bdee8d959f0ed58970538b4ab6004734@339952 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/libcxxabi,llvm-mirror/libcxxabi,llvm-mirror/libcxxabi,llvm-mirror/libcxxabi,llvm-mirror/libcxxabi