search for: cxx1z_status

...rL221663). * Support for `__has_cpp_attribute` is now present. [r221991](http://reviews.llvm.org/rL221991). ## Other project commits * Breakpoint stop/resume has been implemented on Windows for LLDB. [r221642](http://reviews.llvm.org/rL221642). * The [libcxx status page](http://libcxx.llvm.org/cxx1z_status.html) has been updated with the current state of C++1z support. [r221601](http://reviews.llvm.org/rL221601)).