add async-functions feature to files which should have it

test/language/expressions/async-arrow-function/await-as-param-ident-nested-arrow-parameter-position.js

@@ -8,6 +8,7 @@ description: >
 negative:
   phase: parse
   type: SyntaxError
+features: [async-functions]
 ---*/
 
 $DONOTEVALUATE();

test/language/expressions/async-arrow-function/await-as-param-nested-arrow-body-position.js

@@ -8,6 +8,7 @@ description: >
 negative:
   phase: parse
   type: SyntaxError
+features: [async-functions]
 ---*/
 
 $DONOTEVALUATE();

test/language/expressions/async-arrow-function/await-as-param-nested-arrow-parameter-position.js

@@ -8,6 +8,7 @@ description: >
 negative:
   phase: parse
   type: SyntaxError
+features: [async-functions]
 ---*/
 
 $DONOTEVALUATE();

test/language/expressions/async-arrow-function/await-as-param-rest-nested-arrow-parameter-position.js

@@ -8,6 +8,7 @@ description: >
 negative:
   phase: parse
   type: SyntaxError
+features: [async-functions]
 ---*/
 
 $DONOTEVALUATE();

test/language/expressions/async-arrow-function/early-errors-arrow-duplicate-parameters.js

@@ -27,6 +27,7 @@ info: |
 negative:
   phase: parse
   type: SyntaxError
+features: [async-functions]
 ---*/
 
 $DONOTEVALUATE();

test/language/expressions/object/method-definition/early-errors-object-method-arguments-in-formal-parameters.js

@@ -9,6 +9,7 @@ negative:
   phase: parse
   type: SyntaxError
 flags: [onlyStrict]
+features: [async-functions]
 ---*/
 
 $DONOTEVALUATE();

test/language/expressions/object/method-definition/early-errors-object-method-await-in-formals-default.js

@@ -8,6 +8,7 @@ description: It is a SyntaxError if FormalParameters' default expressions contai
 negative:
   phase: parse
   type: SyntaxError
+features: [async-functions]
 ---*/
 
 $DONOTEVALUATE();

test/language/expressions/object/method-definition/early-errors-object-method-await-in-formals.js

@@ -8,6 +8,7 @@ description: It is a SyntaxError if FormalParameters contains await
 negative:
   phase: parse
   type: SyntaxError
+features: [async-functions]
 ---*/
 
 $DONOTEVALUATE();

test/language/expressions/object/method-definition/early-errors-object-method-body-contains-super-call.js

@@ -8,6 +8,7 @@ description: It is a SyntaxError if AsyncFunctionBody contains SuperCall is true
 negative:
   phase: parse
   type: SyntaxError
+features: [async-functions]
 ---*/
 
 $DONOTEVALUATE();

test/language/expressions/object/method-definition/early-errors-object-method-eval-in-formal-parameters.js

@@ -9,6 +9,7 @@ negative:
   phase: parse
   type: SyntaxError
 flags: [onlyStrict]
+features: [async-functions]
 ---*/
 
 $DONOTEVALUATE();

test/language/expressions/object/method-definition/early-errors-object-method-formals-body-duplicate.js

@@ -8,6 +8,7 @@ description: It is a SyntaxError if BoundNames of FormalParameters also occurs i
 negative:
   phase: parse
   type: SyntaxError
+features: [async-functions]
 ---*/
 
 $DONOTEVALUATE();

test/language/expressions/object/method-definition/object-method-returns-promise.js

@@ -6,6 +6,7 @@ author: Brian Terlson <brian.terlson@microsoft.com>
 esid: pending
 description: >
   Async function method definitions return promises
+features: [async-functions]
 ---*/
 var obj = {
   async method() {}