suite_aggr: - bounds checking memory of struct return values, to spot overflow errors by dcCallStruct - added clearing of space aggregate data is written to, to be in line with other data which is cleared - some optimization

#!/bin/sh
`which gcc || which clang` -E -P -DGEN_MASM ${1:?Usage: $0 <name> [<outsuffix>]}.S \
	| sed "/^$/d;1i\\
; auto-generated by `basename $0`
;s/$/
/" \
	> $1$2.asm