[PATCH] [arm] Implement ARM .arch directive.

[Renato Golin]

  I agree with Richard's analysis about having it on too many places. Though, I can't offer you a better implementation.

  About the .arch, I seem to remember GAS blatanly ignoring the options and re-setting all of them based on .arch/.cpu/.fpu, so that might have an effect where you'll overwrite some of the attributes on your object files that were not emmitted on your asm file. Though, I agree, this is a bug in GAS, and should not be "fixed" here, I'm just making sure you have tested on recent assemblers to make sure no odd behaviour will come from it.

http://llvm-reviews.chandlerc.com/D2133