Parse class heritage as strict mode code (#9315)

packages/babel-parser/test/fixtures/es2015/class/extends-strict/input.js

@@ -0,0 +1,4 @@
+class C extends (function B() {
+  with ({});
+  return B;
+}()) {}

packages/babel-parser/test/fixtures/es2015/class/extends-strict/options.json

@@ -0,0 +1,3 @@
+{
+  "throws": "'with' in strict mode (2:2)"
+}

packages/babel-parser/test/fixtures/es2015/yield/in-class-heritage/options.json

@@ -1,3 +1,3 @@
 {
-  "throws": "Unexpected token, expected \"{\" (1:22)"
+  "throws": "yield is a reserved word in strict mode (1:16)"
 }