ARM: 8172/1: Use current_stack_pointer in save_stack_trace_tsk
ARM: 8172/1: Use current_stack_pointer in save_stack_trace_tsk

Use the global current_stack_pointer to get the value of the stack pointer.
This change supports being able to compile the kernel with both gcc and clang.

Signed-off-by: Behan Webster <9152da451d71c2a1ceb0c7b0908d4018fc127ae6@converseincode.com>
Reviewed-by: Mark Charlebois <f1891e7fc976ae1bd489627e2954fb730751d728@gmail.com>
Reviewed-by: Jan-Simon Möller <36ded0fe241474e14ca49d9021f8ba3a70d78d60@gmx.de>
Acked-by: Will Deacon <b913f13ef92ac157955c954ccaaff7be065faba4@arm.com>
Acked-by: Nicolas Pitre <d659c10e27d52b00987b65e85d99bce5480adcae@linaro.org>
Signed-off-by: Russell King <f6aa0246ff943bfa8602cdf60d40c481b38ed232@arm.linux.org.uk>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs