[PATCH] Use ".arch_extension" ARM directive to support hwdiv on krait

[Sumanth Gundapaneni]

This patch is breaking the mips bot here.
Any idea why ? 
http://lab.llvm.org:8011/builders/llvm-mips-linux/builds/12343/steps/configure/logs/stdio


http://reviews.llvm.org/D7819

EMAIL PREFERENCES
  http://reviews.llvm.org/settings/panel/emailpreferences/