Comment 3 for bug 1192929

It's not actually caused by this commit directly, but is due to clobbering of RCX, the register where the number of arguments is passed. And the debugger uses it to reconstruct the arguments, 4611686018427387900 of them in this case. I can target the temporary register to RAX, but this problem is still present with any code inside XEPs which happens to touch RCX and throw an error.