scons: Switch from the print statement to the print function.

Starting with version 3, scons imposes using the print function instead
of the print statement in code it processes. To get things building
again, this change moves all python code within gem5 to use the
function version. Another change by another author separately made this
same change to the site_tools and site_init.py files.

Change-Id: I2de7dc3b1be756baad6f60574c47c8b7e80ea3b0
Reviewed-on: https://gem5-review.googlesource.com/8761
Reviewed-by: Andreas Sandberg <andreas.sandberg@arm.com>
Reviewed-by: Jason Lowe-Power <jason@lowepower.com>
Maintainer: Gabe Black <gabeblack@google.com>

Add a second section to make sure the ROM is extended properly.

Do something with ROM based macroops

Make directives take parameters and use the directive function and not it's name

Handle comments

Early micro assembler

src/arch/micro_asm.py:
Micro assembler
src/arch/micro_asm_test.py:
Test script for the micro assembler. This probably should go somewhere else eventually.