[vm,bytecode] Omit initialization of delayed type arguments for non-generic closures

Delayed type arguments are only used by generic closure functions, so
their initialization can be omitted for non-generic closures.

This is the follow-up for 1f58504.

Change-Id: I61b05a4a4e2af4d2d8a543f6eec985a47b811761
Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/121924
Reviewed-by: Vyacheslav Egorov <vegorov@google.com>
Commit-Queue: Alexander Markov <alexmarkov@google.com>

Author: alexmarkov

pkg/vm/lib/bytecode/gen_bytecode.dart

@@ -2614,9 +2614,12 @@ class BytecodeGenerator extends RecursiveVisitor<Null> {
     _genPushFunctionTypeArguments();
     asm.emitStoreFieldTOS(cp.addInstanceField(closureFunctionTypeArguments));
 
-    asm.emitPush(temp);
-    asm.emitPushConstant(cp.addEmptyTypeArguments());
-    asm.emitStoreFieldTOS(cp.addInstanceField(closureDelayedTypeArguments));
+    // Delayed type arguments are only used by generic closures.
+    if (function.typeParameters.isNotEmpty) {
+      asm.emitPush(temp);
+      asm.emitPushConstant(cp.addEmptyTypeArguments());
+      asm.emitStoreFieldTOS(cp.addInstanceField(closureDelayedTypeArguments));
+    }
 
     asm.emitPush(temp);
     asm.emitPushConstant(closureFunctionIndex);