Revert "Move asm! and global_asm! to core::arch (#1183)" (#1185)

This reverts commit 9437b11.

crates/core_arch/src/mod.rs

@@ -11,32 +11,6 @@ mod simd;
 #[doc = include_str!("core_arch_docs.md")]
 #[stable(feature = "simd_arch", since = "1.27.0")]
 pub mod arch {
-    /// Inline assembly.
-    ///
-    /// Read the [unstable book] for the usage.
-    ///
-    /// [unstable book]: ../unstable-book/library-features/asm.html
-    #[unstable(
-        feature = "asm",
-        issue = "72016",
-        reason = "inline assembly is not stable enough for use and is subject to change"
-    )]
-    #[rustc_builtin_macro]
-    pub macro asm("assembly template", $(operands,)* $(options($(option),*))?) {
-        /* compiler built-in */
-    }
-
-    /// Module-level inline assembly.
-    #[unstable(
-        feature = "global_asm",
-        issue = "35119",
-        reason = "`global_asm!` is not stable enough for use and is subject to change"
-    )]
-    #[rustc_builtin_macro]
-    pub macro global_asm("assembly template", $(operands,)* $(options($(option),*))?) {
-        /* compiler built-in */
-    }
-
     /// Platform-specific intrinsics for the `x86` platform.
     ///
     /// See the [module documentation](../index.html) for more details.