Fix tests that only broke during cross compilation

Author: tdittr

tests/ui/c-variadic/feature-gate-extended_varargs_abi_support.rs

@@ -1,3 +1,5 @@
+//@ only-x86_64
+
 fn efiapi(f: extern "efiapi" fn(usize, ...)) {
     //~^ ERROR: C-variadic function must have a compatible calling convention, like `C` or `cdecl`
     //~^^ ERROR: using calling conventions other than `C` or `cdecl` for varargs functions is unstable

tests/ui/c-variadic/feature-gate-extended_varargs_abi_support.stderr

@@ -1,5 +1,5 @@
 error[E0658]: using calling conventions other than `C` or `cdecl` for varargs functions is unstable
-  --> $DIR/feature-gate-extended_varargs_abi_support.rs:1:14
+  --> $DIR/feature-gate-extended_varargs_abi_support.rs:3:14
    |
 LL | fn efiapi(f: extern "efiapi" fn(usize, ...)) {
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -9,13 +9,13 @@ LL | fn efiapi(f: extern "efiapi" fn(usize, ...)) {
    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0045]: C-variadic function must have a compatible calling convention, like `C` or `cdecl`
-  --> $DIR/feature-gate-extended_varargs_abi_support.rs:1:14
+  --> $DIR/feature-gate-extended_varargs_abi_support.rs:3:14
    |
 LL | fn efiapi(f: extern "efiapi" fn(usize, ...)) {
    |              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ C-variadic function must have a compatible calling convention
 
 error[E0658]: using calling conventions other than `C` or `cdecl` for varargs functions is unstable
-  --> $DIR/feature-gate-extended_varargs_abi_support.rs:6:12
+  --> $DIR/feature-gate-extended_varargs_abi_support.rs:8:12
    |
 LL | fn sysv(f: extern "sysv64" fn(usize, ...)) {
    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -25,13 +25,13 @@ LL | fn sysv(f: extern "sysv64" fn(usize, ...)) {
    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0045]: C-variadic function must have a compatible calling convention, like `C` or `cdecl`
-  --> $DIR/feature-gate-extended_varargs_abi_support.rs:6:12
+  --> $DIR/feature-gate-extended_varargs_abi_support.rs:8:12
    |
 LL | fn sysv(f: extern "sysv64" fn(usize, ...)) {
    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ C-variadic function must have a compatible calling convention
 
 error[E0658]: using calling conventions other than `C` or `cdecl` for varargs functions is unstable
-  --> $DIR/feature-gate-extended_varargs_abi_support.rs:11:11
+  --> $DIR/feature-gate-extended_varargs_abi_support.rs:13:11
    |
 LL | fn win(f: extern "win64" fn(usize, ...)) {
    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
@@ -41,7 +41,7 @@ LL | fn win(f: extern "win64" fn(usize, ...)) {
    = note: this compiler was built on YYYY-MM-DD; consider upgrading it if it is out of date
 
 error[E0045]: C-variadic function must have a compatible calling convention, like `C` or `cdecl`
-  --> $DIR/feature-gate-extended_varargs_abi_support.rs:11:11
+  --> $DIR/feature-gate-extended_varargs_abi_support.rs:13:11
    |
 LL | fn win(f: extern "win64" fn(usize, ...)) {
    |           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ C-variadic function must have a compatible calling convention

tests/ui/c-variadic/variadic-ffi-2-arm.rs

@@ -0,0 +1,9 @@
+//@ only-arm
+//@ build-pass
+#![feature(extended_varargs_abi_support)]
+
+fn aapcs(f: extern "aapcs" fn(usize, ...)) {
+    f(22, 44);
+}
+
+fn main() {}

tests/ui/c-variadic/variadic-ffi-2.rs

@@ -11,13 +11,11 @@ fn baz(f: extern "stdcall" fn(usize, ...)) {
 fn system(f: extern "system" fn(usize, ...)) {
     f(22, 44);
 }
-#[cfg(target_arch = "arm")]
-fn aapcs(f: extern "aapcs" fn(usize, ...)) {
-    f(22, 44);
-}
+#[cfg(target_arch = "x86_64")]
 fn sysv(f: extern "sysv64" fn(usize, ...)) {
     f(22, 44);
 }
+#[cfg(target_arch = "x86_64")]
 fn win(f: extern "win64" fn(usize, ...)) {
     f(22, 44);
 }