Make libc++abi use the implementation of __numstr from libc++. No functionality change, just removal of duplicated code.
Make libc++abi use the implementation of __numstr from libc++. No functionality change, just removal of duplicated code.

git-svn-id: 6a9f6578bdee8d959f0ed58970538b4ab6004734@208246 91177308-0d34-0410-b5e6-96231b3b80d8

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