[PATCH] Improved udivmodsi4 with support for ARMv4

[Joerg Sonnenberger]

  Fix a incorrect condition in the last step of shift computation for non-clz ARM.
  Provide __ARM_ARCH for compilers lacking it and move feature checks into assembly.h.
  Implement __udivsi3 and __umodsi3 using the base version.

Hi t.p.northover, compnerd,

http://llvm-reviews.chandlerc.com/D2595

CHANGE SINCE LAST DIFF
  http://llvm-reviews.chandlerc.com/D2595?vs=6582&id=6612#toc

Files:
  lib/arm/udivmodsi4.S
  lib/arm/udivsi3.S
  lib/arm/umodsi3.S
  lib/assembly.h
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