test compile
target aarch64

function %f(i64, i64) -> i64 {
    sig0 = (i64) -> i64
block0(v0: i64, v1: i64):
    v2 = call_indirect.i64 sig0, v1(v0)
    return v2
}

; check:  stp fp, lr, [sp, #-16]!
; nextln:  mov fp, sp
; nextln:  blr x1
; nextln:  mov sp, fp
; nextln:  ldp fp, lr, [sp], #16
; nextln:  ret