toolchain/53909: broken types on aarch64

[coypu%sdf.org@localhost]

>Number:         53909
>Category:       toolchain
>Synopsis:       broken types on aarch64
>Confidential:   no
>Severity:       critical
>Priority:       high
>Responsible:    toolchain-manager
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Fri Jan 25 17:00:00 +0000 2019
>Originator:     coypu
>Release:        NetBSD 8.99.30
>Organization:
>Environment:
NetBSD planets 8.99.30 NetBSD 8.99.30 (GENERIC) #0: Thu Jan 10 15:02:02 IST 2019  fly@planets:/home/fly/obj2/sys/arch/amd64/compile/GENERIC amd64

>Description:
> cat aarch64-types.cpp 
#include <cstddef>
int one() {
	return sizeof(std::size_t); // 8
}

int two() {
	return sizeof(size_t); // 4
}


> /current/obj-aarch64/tooldir.NetBSD-8.99.30-amd64/bin/aarch64--netbsd-g++ -S -o /dev/stdout aarch64-types.cpp 
	.arch armv8-a
	.file	"aarch64-types.cpp"
	.text
	.align	2
	.global	_Z3onev
	.type	_Z3onev, %function
_Z3onev:
.LFB2:
	.cfi_startproc
	mov	w0, 8
	ret
	.cfi_endproc
.LFE2:
	.size	_Z3onev, .-_Z3onev
	.align	2
	.global	_Z3twov
	.type	_Z3twov, %function
_Z3twov:
.LFB3:
	.cfi_startproc
	mov	w0, 4
	ret
	.cfi_endproc
.LFE3:
	.size	_Z3twov, .-_Z3twov
	.ident	"GCC: (NetBSD nb4 20181109) 6.5.0"


This breaks building some C++ code:
/usr/include/g++/bits/basic_string.h:5630:23: note:   mismatched types 'std::size_t {aka long unsigned int}' and 'size_t {aka unsigned int}' L"%Lf", __val);
>How-To-Repeat:

>Fix: