Improve test_tailcall_omit_mov_x16_x16 and rollback x1->x2 change

Author: atrosinenko

llvm/test/CodeGen/AArch64/ptrauth-call.ll

@@ -169,13 +169,13 @@ define i32 @test_tailcall_ib_var(ptr %arg0, ptr %arg1) #0 {
 
 define void @test_tailcall_omit_mov_x16_x16(ptr %objptr) #0 {
 ; CHECK-LABEL: test_tailcall_omit_mov_x16_x16:
-; CHECK:         ldr     x16, [x0]
-; CHECK:         mov     x17, x0
-; CHECK:         movk    x17, #6503, lsl #48
-; CHECK:         autda   x16, x17
-; CHECK:         ldr     x2, [x16]
-; CHECK:         movk    x16, #54167, lsl #48
-; CHECK:         braa    x2, x16
+; CHECK-NEXT:    ldr     x16, [x0]
+; CHECK-NEXT:    mov     x17, x0
+; CHECK-NEXT:    movk    x17, #6503, lsl #48
+; CHECK-NEXT:    autda   x16, x17
+; CHECK-NEXT:    ldr     x1, [x16]
+; CHECK-NEXT:    movk    x16, #54167, lsl #48
+; CHECK-NEXT:    braa    x1, x16
   %vtable.signed = load ptr, ptr %objptr, align 8
   %objptr.int = ptrtoint ptr %objptr to i64
   %vtable.discr = tail call i64 @llvm.ptrauth.blend(i64 %objptr.int, i64 6503)