Move a debug warning to runtime_debug.js. NFC (#24947)

Author: sbc100

src/postamble.js

@@ -427,7 +427,3 @@ var workerResponded = false, workerCallbackId = -1;
 })();
 
 #endif
-
-#if STANDALONE_WASM && ASSERTIONS && !WASM_BIGINT
-err('warning: running JS from STANDALONE_WASM without WASM_BIGINT will fail if a syscall with i64 is used (in standalone mode we cannot legalize syscalls)');
-#endif

src/runtime_debug.js

@@ -29,6 +29,10 @@ function dbg(...args) {
 
 #if ASSERTIONS
 
+#if STANDALONE_WASM && !WASM_BIGINT
+err('warning: running JS from STANDALONE_WASM without WASM_BIGINT will fail if a syscall with i64 is used (in standalone mode we cannot legalize syscalls)');
+#endif
+
 // Endianness check
 #if !SUPPORT_BIG_ENDIAN
 (() => {