Allow function_casts_as_integer in non-related miri tests

Author: GuillaumeGomez

src/tools/miri/tests/pass/backtrace/backtrace-api-v1.rs

@@ -1,5 +1,7 @@
 //@normalize-stderr-test: "::<.*>" -> ""
 
+#![allow(function_casts_as_integer)]
+
 #[inline(never)]
 fn func_a() -> Box<[*mut ()]> {
     func_b::<u8>()

src/tools/miri/tests/pass/backtrace/backtrace-api-v1.stdout

@@ -1,5 +1,5 @@
-tests/pass/backtrace/backtrace-api-v1.rs:27:9 (func_d)
-tests/pass/backtrace/backtrace-api-v1.rs:14:9 (func_c)
-tests/pass/backtrace/backtrace-api-v1.rs:9:5 (func_b::<u8>)
-tests/pass/backtrace/backtrace-api-v1.rs:5:5 (func_a)
-tests/pass/backtrace/backtrace-api-v1.rs:34:18 (main)
+tests/pass/backtrace/backtrace-api-v1.rs:29:9 (func_d)
+tests/pass/backtrace/backtrace-api-v1.rs:16:9 (func_c)
+tests/pass/backtrace/backtrace-api-v1.rs:11:5 (func_b::<u8>)
+tests/pass/backtrace/backtrace-api-v1.rs:7:5 (func_a)
+tests/pass/backtrace/backtrace-api-v1.rs:36:18 (main)

src/tools/miri/tests/pass/fn_align.rs

@@ -1,5 +1,6 @@
 //@compile-flags: -Zmin-function-alignment=8
 #![feature(fn_align)]
+#![allow(function_casts_as_integer)]
 
 // When a function uses `repr(align(N))`, the function address should be a multiple of `N`.