x86/refcounts: Switch to UD2 for exceptions
As done in commit 3b3a371c ("x86/debug: Use UD2 for WARN()"), this switches to UD2 from UD0 to keep disassembly readable. Signed-off-by: NKees Cook <keescook@chromium.org> Signed-off-by: NThomas Gleixner <tglx@linutronix.de> Cc: Peter Zijlstra <peterz@infradead.org> Link: https://lkml.kernel.org/r/20180225165056.GA11719@beast
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