decoder/tools: Generate arm64 instruction size constant

Signed-off-by: Ronald Caesar <github43132@proton.me>

src/decoder_table_gen.h

@@ -1,6 +1,8 @@
 /* Generated header file */
 #include <stdint.h>
 
+#define BAL_DECODER_ARM64_INSTRUCTIONS_SIZE 2807
+
 typedef struct 
 {
  const char* mnemonic; 

tools/generate_a64_table.py

@@ -212,6 +212,7 @@ if __name__ == "__main__":
     with open(out_file_header, "w") as f:
         f.write(f"/* Generated header file */\n")
         f.write("#include <stdint.h>\n\n")
+        f.write(f"#define BAL_DECODER_ARM64_INSTRUCTIONS_SIZE {len(all_instructions)}\n\n")
         f.write(
             "typedef struct \n{\n const char* mnemonic; \n uint32_t mask;\n uint32_t value;\n} bal_decoder_entry_t;\n"
         )