Cherry-pick PR microsoft#34954 into release-3.7

Component commits:
84ebe22 strip QuestionToken from MethodDeclartion emit
Fixes: microsoft#34953

5269071 test property emit

Author: ajafff

src/compiler/binder.ts

@@ -3639,7 +3639,8 @@ namespace ts {
             || hasModifier(node, ModifierFlags.TypeScriptModifier)
             || node.typeParameters
             || node.type
-            || !node.body) {
+            || !node.body
+            || node.questionToken) {
             transformFlags |= TransformFlags.AssertTypeScript;
         }
 
@@ -3686,7 +3687,7 @@ namespace ts {
         let transformFlags = subtreeFlags | TransformFlags.ContainsClassFields;
 
         // Decorators, TypeScript-specific modifiers, and type annotations are TypeScript syntax.
-        if (some(node.decorators) || hasModifier(node, ModifierFlags.TypeScriptModifier) || node.type) {
+        if (some(node.decorators) || hasModifier(node, ModifierFlags.TypeScriptModifier) || node.type || node.questionToken) {
             transformFlags |= TransformFlags.AssertTypeScript;
         }
 

tests/baselines/reference/optionalMethod.js

@@ -0,0 +1,10 @@
+//// [optionalMethod.ts]
+class Base {
+    method?() { }
+}
+
+
+//// [optionalMethod.js]
+class Base {
+    method() { }
+}

tests/baselines/reference/optionalProperty.js

@@ -0,0 +1,10 @@
+//// [optionalProperty.ts]
+class C {
+    prop?;
+}
+
+
+//// [optionalProperty.js]
+class C {
+    prop;
+}

tests/cases/conformance/classes/propertyMemberDeclarations/optionalMethod.ts

@@ -0,0 +1,5 @@
+// @target: esnext
+// @noTypesAndSymbols: true
+class Base {
+    method?() { }
+}

tests/cases/conformance/classes/propertyMemberDeclarations/optionalProperty.ts

@@ -0,0 +1,6 @@
+// @target: esnext
+// @useDefineForClassFields: true
+// @noTypesAndSymbols: true
+class C {
+    prop?;
+}