Fix ARM syscall argument loading.
Fix ARM syscall argument loading.

This patch is a uClibc equivalent of
<http://sourceware.org/ml/libc-ports/2008-11/msg00006.html>, to
compute all syscall arguments on ARM in temporary variables before
loading them into register variables.  The principle is as for that
glibc patch; the problem I actually observed was a GCC internal
compiler error building ld.so for Thumb-2.

Signed-off-by: Joseph Myers <461476587780aa9fa5611ea6dc3912c146a91760@codesourcery.com>

brgl/uclibc-ng,OpenInkpot-archive/iplinux-uclibc,skristiansson/uClibc-or1k,foss-xtensa/uClibc,hjl-tools/uClibc,brgl/uclibc-ng,kraj/uClibc,foss-xtensa/uClibc,foss-for-synopsys-dwc-arc-processors/uClibc,czankel/xtensa-uclibc,skristiansson/uClibc-or1k,m-labs/uclibc-lm32,foss-for-synopsys-dwc-arc-processors/uClibc,wbx-github/uclibc-ng,brgl/uclibc-ng,mephi42/uClibc,foss-xtensa/uClibc,foss-xtensa/uClibc,czankel/xtensa-uclibc,kraj/uclibc-ng,kraj/uClibc,foss-for-synopsys-dwc-arc-processors/uClibc,kraj/uClibc,ysat0/uClibc,groundwater/uClibc,wbx-github/uclibc-ng,skristiansson/uClibc-or1k,groundwater/uClibc,skristiansson/uClibc-or1k,atgreen/uClibc-moxie,ffainelli/uClibc,mephi42/uClibc,foss-for-synopsys-dwc-arc-processors/uClibc,mephi42/uClibc,kraj/uClibc,ndmsystems/uClibc,kraj/uclibc-ng,kraj/uclibc-ng,hjl-tools/uClibc,ysat0/uClibc,ffainelli/uClibc,ddcc/klee-uclibc-0.9.33.2,wbx-github/uclibc-ng,m-labs/uclibc-lm32,hwoarang/uClibc,hwoarang/uClibc,majek/uclibc-vx32,ysat0/uClibc,brgl/uclibc-ng,m-labs/uclibc-lm32,ndmsystems/uClibc,groundwater/uClibc,ddcc/klee-uclibc-0.9.33.2,ndmsystems/uClibc,czankel/xtensa-uclibc,majek/uclibc-vx32,ysat0/uClibc,hjl-tools/uClibc,majek/uclibc-vx32,ffainelli/uClibc,OpenInkpot-archive/iplinux-uclibc,hwoarang/uClibc,OpenInkpot-archive/iplinux-uclibc,waweber/uclibc-clang,groundwater/uClibc,atgreen/uClibc-moxie,OpenInkpot-archive/iplinux-uclibc,ffainelli/uClibc,ddcc/klee-uclibc-0.9.33.2,hwoarang/uClibc,ndmsystems/uClibc,gittup/uClibc,ffainelli/uClibc,wbx-github/uclibc-ng,hjl-tools/uClibc,m-labs/uclibc-lm32,czankel/xtensa-uclibc,gittup/uClibc,atgreen/uClibc-moxie,gittup/uClibc,majek/uclibc-vx32,atgreen/uClibc-moxie,waweber/uclibc-clang,waweber/uclibc-clang,hjl-tools/uClibc,gittup/uClibc,groundwater/uClibc,kraj/uclibc-ng,mephi42/uClibc,waweber/uclibc-clang,ddcc/klee-uclibc-0.9.33.2