Reduce binary size using const arrays

Before, the mnemonic arrays would be generated
on the stack at runtime in each parse function.
This ensures that the arrays  themselves are
treated as const data.

genisa/src/disasm.rs

@@ -465,6 +465,10 @@ fn gen_mnemonic(
                 bitset.extend(quote! { | (ins.#modifier() as usize) << #i });
             }
         }
-        Ok(quote! { ParsedIns { mnemonic: [#(#names),*][#bitset], args: #arguments } })
+        let names_len = Literal::usize_unsuffixed(names.len());
+        Ok(quote! { {
+            const MODIFIERS: [&str; #names_len] = [#(#names),*];
+            ParsedIns { mnemonic: MODIFIERS[#bitset], args: #arguments }
+        } })
     }
 }