Add atomic arch instructions

Author: XAMPPRocky

crates/spirv-builder/src/lib.rs

@@ -200,7 +200,7 @@ fn invoke_rustc(builder: &SpirvBuilder) -> Result<PathBuf, SpirvBuilderError> {
         format!(" -C target-feature={}", target_features.join(","))
     };
     let rustflags = format!(
-        "-Z codegen-backend={} -Z symbol-mangling-version=v0{}",
+        "-Z codegen-backend={}{}",
         rustc_codegen_spirv.display(),
         feature_flag,
     );

crates/spirv-std/src/arch.rs

@@ -9,13 +9,17 @@ use crate::{scalar::Scalar, vector::Vector};
 #[cfg(feature = "const-generics")]
 mod arithmetic;
 #[cfg(feature = "const-generics")]
+mod atomics;
+#[cfg(feature = "const-generics")]
 mod barrier;
 mod derivative;
 mod primitive;
 
 #[cfg(feature = "const-generics")]
 pub use arithmetic::*;
 #[cfg(feature = "const-generics")]
+pub use atomics::*;
+#[cfg(feature = "const-generics")]
 pub use barrier::*;
 pub use derivative::*;
 pub use primitive::*;