Fix Bug 30240 - std::string: append(first, last) error when aliasing. Add test cases for append/insert/assign/replace while we're at it, and fix a similar bug in insert. git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@280643 91177308-0d34-0410-b5e6-96231b3b80d8 
13 files changed