Correct logic bug in find optimization for vector<bool>.  This fixes http://llvm.org/bugs/show_bug.cgi?id=16816

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@187908 91177308-0d34-0410-b5e6-96231b3b80d8
N3644 support for <string> and <vector>

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@187909 91177308-0d34-0410-b5e6-96231b3b80d8
N3644 support for vector<bool>

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@187910 91177308-0d34-0410-b5e6-96231b3b80d8
N3644 support for vector<bool>

git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@187911 91177308-0d34-0410-b5e6-96231b3b80d8