Needed so that we can build simulator builds for x86_64 as well as
i386. The function call alignment is the same, but we need to use
the 64-bit versions of the instruction and operands.

Change-Id: I62cc78e23b5e0923382d19570ce18f558894e6a0
Reviewed-by: Simon Hausmann <simon.hausmann@digia.com>