ExcServerVariants test: don’t test debug thread state flavors.
ExcServerVariants test: don’t test debug thread state flavors.

Kernel bugs prevent debug thread state flavors from being delivered to
exception handlers properly. Through luck, things work out for
x86_DEBUG_STATE and x86_DEBUG_STATE64, but a handler registered to
receive the x86_DEBUG_STATE32 thread state flavor will never be called.
For the x86 family, the only thread state flavors that can be delivered
to exception handlers are the thread, float, and exception flavors.

Radar 18312067 is filed.

TEST=util_test ExcServerVariants.ThreadStates
R=rsesek@chromium.org

Review URL: https://codereview.chromium.org/558503006

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