Ignore Atomic*::fetch_{min,max} tests on ARM

Author: bjorn3

library/core/tests/atomic.rs

@@ -60,6 +60,7 @@ fn uint_xor() {
 }
 
 #[test]
+#[cfg(not(target_arch = "arm"))] // Missing intrinsic in compiler-builtins
 fn uint_min() {
     let x = AtomicUsize::new(0xf731);
     assert_eq!(x.fetch_min(0x137f, SeqCst), 0xf731);
@@ -69,6 +70,7 @@ fn uint_min() {
 }
 
 #[test]
+#[cfg(not(target_arch = "arm"))] // Missing intrinsic in compiler-builtins
 fn uint_max() {
     let x = AtomicUsize::new(0x137f);
     assert_eq!(x.fetch_max(0xf731, SeqCst), 0x137f);
@@ -106,6 +108,7 @@ fn int_xor() {
 }
 
 #[test]
+#[cfg(not(target_arch = "arm"))] // Missing intrinsic in compiler-builtins
 fn int_min() {
     let x = AtomicIsize::new(0xf731);
     assert_eq!(x.fetch_min(0x137f, SeqCst), 0xf731);
@@ -115,6 +118,7 @@ fn int_min() {
 }
 
 #[test]
+#[cfg(not(target_arch = "arm"))] // Missing intrinsic in compiler-builtins
 fn int_max() {
     let x = AtomicIsize::new(0x137f);
     assert_eq!(x.fetch_max(0xf731, SeqCst), 0x137f);