[PATCH] optimize vector fabs of bitcasted constant integer values

[Renato Golin]

Hi Sanjay,

That looks good to me, thanks for taking the time.

Duplicating the fabs case in the ARM tree adding a CHECK: mvn + CHECK-NOT: vabs would be great, with a little explanation just like you did for x86.

Thanks!
--renato

http://reviews.llvm.org/D4785