Comment 6 for bug 1856377

Thanks.

Following is result of "cc -S":

        .text
        .file "foo.c"
        .globl main // -- Begin function main
        .p2align 2
        .type main,@function
main: // @main
// %bb.0:
        sub sp, sp, #32 // =32
        stp x29, x30, [sp, #16] // 16-byte Folded Spill
        add x29, sp, #16 // =16
        mov x8, #0
        mov x0, x8
        mov w9, #0
        mov w1, w9
        mov x2, x8
        stur w9, [x29, #-4] // 4-byte Folded Spill
        bl wait3
        ldur w9, [x29, #-4] // 4-byte Folded Reload
        mov w0, w9
        ldp x29, x30, [sp, #16] // 16-byte Folded Reload
        add sp, sp, #32 // =32
        ret
.Lfunc_end0:
        .size main, .Lfunc_end0-main
                                        // -- End function
        .p2align 2 // -- Begin function wait3
        .type wait3,@function
wait3: // @wait3
// %bb.0:
        sub sp, sp, #48 // =48
        stp x29, x30, [sp, #32] // 16-byte Folded Spill
        add x29, sp, #32 // =32
        mov w8, #-1
        stur x0, [x29, #-8]
        stur w1, [x29, #-12]
        str x2, [sp, #8]
        ldur x1, [x29, #-8]
        ldur w2, [x29, #-12]
        ldr x3, [sp, #8]
        mov w0, w8
        bl wait4
        ldp x29, x30, [sp, #32] // 16-byte Folded Reload
        add sp, sp, #48 // =48
        ret
.Lfunc_end1:
        .size wait3, .Lfunc_end1-wait3
                                        // -- End function

        .ident "clang version 9.0.0 (tags/RELEASE_900/final)"
        .section ".note.GNU-stack","",@progbits