[IA64] signal(ia64): add a signal stack overflow check
The similar check has been added to x86_32(i386) in commit id 83bd0102 . So we add this check to ia64 and improve it a liitle bit in that we need to check for stack overflow only when the signal is on stack. Signed-off-by: Shi Weihua <shiwh@cn.fujitsu.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
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