Merge remote-tracking branch 'qatar/release/0.6' into release/0.6

* qatar/release/0.6:
  arm: Don't clobber callee saved registers in scalarproduct

See: a94d12b69027955f1b01aedffc8dd8c7e96a15cc
Merged-by: Michael Niedermayer <michaelni@gmx.at>