Centralize and standardize logic for ExpressionClassifier accumulation

test/cctest/test-parsing.cc

Index: test/cctest/test-parsing.cc
diff --git a/test/cctest/test-parsing.cc b/test/cctest/test-parsing.cc
index 627d4cb4f0ebe3d4d90acb4ba590db1018cb568f..d50095cdf0cbf8d65ada096cfa489e19be649709 100644
--- a/test/cctest/test-parsing.cc
+++ b/test/cctest/test-parsing.cc
@@ -7817,8 +7817,6 @@ TEST(AsyncAwaitErrors) {
     "var f = async(x = await 1) => x;",
     "var O = { async method(x = await 1) { return x; } };",
 
-    "var f = async(x = await) => 1;",
-
     "function* g() { var f = async yield => 1; }",
     "function* g() { var f = async(yield) => 1; }",
     "function* g() { var f = async(x = yield) => 1; }",
@@ -7895,6 +7893,7 @@ TEST(AsyncAwaitErrors) {
     "var f = async(await) => 1;",
     "var f = async(await = 1) => 1;",
     "var f = async(...[await]) => 1;",
+    "var f = async(x = await) => 1;",
 
     // v8:5190
     "var f = async(1) => 1",
@@ -7903,6 +7902,12 @@ TEST(AsyncAwaitErrors) {
     "var f = async({ foo = async(1) => 1 }) => 1",
     "var f = async({ foo = async(a) => 1 })",
 
+    "var f = async(x = async(await)) => 1;",
+    "var f = async(x = { [await]: 1 }) => 1;",
+    "var f = async(x = class extends (await) { }) => 1;",
+    "var f = async(x = class { static [await]() {} }) => 1;",
+    "var f = async({ x = await }) => 1;",
+
     NULL
   };
   // clang-format on