don't genrate code in src/

[Outputs of Build Script](https://doc.rust-lang.org/cargo/reference/build-scripts.html#outputs-of-the-build-script) states that only files in $OUT_DIR may be modified

crates/instructions-template/src/lib.rs

@@ -3037,11 +3037,13 @@ pub fn generate_instructions_rs() -> TokenStream {
         }
 
         #[macro_export]
-        macro_rules! instr {
+        macro_rules! _instr {
             #(
                 #instr_macro_arms
             );*
         }
+
+        pub use _instr as instr; // https://github.com/rust-lang/rust/pull/52234#issuecomment-976702997
     }
 }