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Returns the value of the stack pointer for the parent stack frame at the point of the call to the function associated with the current stack frame.
If called within a function but outside of a catch or finally block, it returns the parent's stack pointer at the point of the parent's call to the function.
If called within a catch or finally block, it returns the original stack pointer for the function in which the catch or finally block resides.
This routine is only available as an intrinsic.