Corrected SVC stack save code.
Detail: The bottom four words of the SVC stack were being preserved across calls to Wimp_Poll. This is a curious choice, since the bottom seven words are reserved to hold run-time data, and C libraries to date have only used two words (the library and client relocation offsets). Changed to save all seven reserved words across Wimp_Poll. Admin: Tested briefly on an Iyonix, with no visible ill effects. Version 0.71. Tagged as 'TaskWindow-0_71'
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