Control-flow processor exceptions (single-stepping on branches) on control-flow branch instructions (jmp/call/ret)

"single-stepping on branches" is processor hardware feature of x86/Intel architecture. When it is enabled, the processor generates a single-step debug exception only after instructions that cause a branch. This mechanism
allows a debugger to single-step on control transfers caused by branches. What does this imply to defense against control-flow hijacking attacks (e.g. ROP or JOP) ? 

New security feature - Control Flow Guard (CFG) - available in Visual Studio 2015 Preview

This blog announced that the Preview for Visual Studio 2015 includes a new, work-in-progress feature, called Control Flow Guard (CFG).