Changes

* ARM Aarch64 documentation** Instruction Set and Software Developer Manual: http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.genc010197a/index.html** Procedure call reference: http://infocenter.arm.com/help/topic/com.arm.doc.ihi0055b/IHI0055B_aapcs64.pdfpdfhttp://www.intel.com/content/www/us/en/processors/architectures-software-developer-manuals.html* GAS Manual: https://sourceware.org/binutils/docs/as/ Using as, The GNU Assembler]