what's the story with AS_CFI_PSEUDO_OP tests

hi2.c

#include <stdio.h>
// run: clang -S hi2.c

int main(){
  printf("HI");
}

hi2.s

	.text
	.file	"hi2.c"
	.globl	main
	.align	16, 0x90
	.type	main,@function
main:                                   # @main
	.cfi_startproc
# BB#0:                                 # %entry
	pushq	%rbp
.Ltmp0:
	.cfi_def_cfa_offset 16
.Ltmp1:
	.cfi_offset %rbp, -16
	movq	%rsp, %rbp
.Ltmp2:
	.cfi_def_cfa_register %rbp
	subq	$16, %rsp
	movabsq	$.L.str, %rdi
	movb	$0, %al
	callq	printf
	xorl	%ecx, %ecx
	movl	%eax, -4(%rbp)          # 4-byte Spill
	movl	%ecx, %eax
	addq	$16, %rsp
	popq	%rbp
	retq
.Lfunc_end0:
	.size	main, .Lfunc_end0-main
	.cfi_endproc

	.type	.L.str,@object          # @.str
	.section	.rodata.str1.1,"aMS",@progbits,1
.L.str:
	.asciz	"HI"
	.size	.L.str, 3


	.ident	"clang version 3.8.0 (tags/RELEASE_380/final)"
	.section	".note.GNU-stack","",@progbits

test_cfi_pseudo_op.c

// run: clang --target=armv8a--linux-gnueabi  -c test_cfi_pseudo_op.c
// (assuming your llvm supports to the target, works!)
// run: clang -c test_cfi_pseudo_opt.c
// on most desktop, that won't compile, despite clang -S hi2.c producing cfi_startproc
// in the same architecture.  confusing

int main() {
  asm(".cfi_startproc\n\t.cfi_endproc");
}