Incorrect alignment assumptions in x86_64 stacktrace

[Keith Owens]

2.6.18-rc4 arch/x86_64/kernel/stacktrace.c::get_stack_end() incorrectly
assumes that the irqstackptr is IRQSTACKSIZE aligned.

	stack_end = (unsigned long)cpu_pda(cpu)->irqstackptr;
	if (stack_end) {
		stack_start = stack_end & ~(IRQSTACKSIZE-1);

irqstackptr is only guaranteed to be page aligned, not IRQSTACKSIZE
(4*PAGE_SIZE) aligned.

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