For the amd64 platform, we can depend on the TSC being present.  This patch changes DELAY to use the TSC once it has been calibrated.  This does NOT use the TSC for long-term timekeeping.   It only uses it to bound the DELAY() spinloop.  This should not be affected by the Athlon64 X2 TSC quirks because the cpu is not halted while we use DELAY().
For the amd64 platform, we can depend on the TSC being present.  This patch
changes DELAY to use the TSC once it has been calibrated.  This does NOT
use the TSC for long-term timekeeping.   It only uses it to bound the
DELAY() spinloop.  This should not be affected by the Athlon64 X2 TSC
quirks because the cpu is not halted while we use DELAY().

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