Auto merge of #39591 - alexcrichton:revert-128, r=brson

Revert "Add 128-bit atomics"

This reverts commit 9903975.

Unfortunately 128-bit atomics have broken our nightly builds (#39590) and while we investigate I'm posting a temporary revert of the PR that added them. If we can figure out a solution though before this lands I'd be happy to close!

src/libcore/sync/atomic.rs

@@ -1318,24 +1318,6 @@ atomic_int! {
     unstable(feature = "integer_atomics", issue = "32976"),
     u64 AtomicU64 ATOMIC_U64_INIT
 }
-#[cfg(not(stage0))]
-#[cfg(target_has_atomic = "128")]
-atomic_int! {
-    unstable(feature = "i128", issue = "35118"),
-    unstable(feature = "i128", issue = "35118"),
-    unstable(feature = "i128", issue = "35118"),
-    unstable(feature = "i128", issue = "35118"),
-    i128 AtomicI128 ATOMIC_I128_INIT
-}
-#[cfg(not(stage0))]
-#[cfg(target_has_atomic = "128")]
-atomic_int! {
-    unstable(feature = "i128", issue = "35118"),
-    unstable(feature = "i128", issue = "35118"),
-    unstable(feature = "i128", issue = "35118"),
-    unstable(feature = "i128", issue = "35118"),
-    u128 AtomicU128 ATOMIC_U128_INIT
-}
 #[cfg(target_has_atomic = "ptr")]
 atomic_int!{
     stable(feature = "rust1", since = "1.0.0"),

src/test/run-make/atomic-lock-free/atomic_lock_free.rs

@@ -8,7 +8,7 @@
 // option. This file may not be copied, modified, or distributed
 // except according to those terms.
 
-#![feature(cfg_target_has_atomic, no_core, intrinsics, lang_items, i128_type)]
+#![feature(cfg_target_has_atomic, no_core, intrinsics, lang_items)]
 #![crate_type="rlib"]
 #![no_core]
 
@@ -54,14 +54,6 @@ pub unsafe fn atomic_u64(x: *mut u64) {
 pub unsafe fn atomic_i64(x: *mut i64) {
     atomic_xadd(x, 1);
 }
-#[cfg(target_has_atomic = "128")]
-pub unsafe fn atomic_u128(x: *mut u128) {
-    atomic_xadd(x, 1);
-}
-#[cfg(target_has_atomic = "128")]
-pub unsafe fn atomic_i128(x: *mut i128) {
-    atomic_xadd(x, 1);
-}
 #[cfg(target_has_atomic = "ptr")]
 pub unsafe fn atomic_usize(x: *mut usize) {
     atomic_xadd(x, 1);