Fix emit duplicate comment

Author: Kanchalai Tanglertsampan

src/compiler/emitter.ts

@@ -3011,7 +3011,7 @@ namespace ts {
         NoInterveningComments = 1 << 17, // Do not emit comments between each node
 
         // Precomputed Formats
-        Modifiers = SingleLine | SpaceBetweenSiblings,
+        Modifiers = SingleLine | SpaceBetweenSiblings | NoInterveningComments,
         HeritageClauses = SingleLine | SpaceBetweenSiblings,
         SingleLineTypeLiteralMembers = SingleLine | SpaceBetweenBraces | SpaceBetweenSiblings | Indented,
         MultiLineTypeLiteralMembers = MultiLine | Indented,

tests/baselines/reference/alwaysStrictModule3.js

@@ -4,5 +4,4 @@ export const a = 1;
 
 //// [alwaysStrictModule3.js]
 // module ES2015
-// module ES2015
 export var a = 1;

tests/baselines/reference/alwaysStrictModule5.js

@@ -4,5 +4,4 @@ export const a = 1;
 
 //// [alwaysStrictModule5.js]
 // Targeting ES6
-// Targeting ES6
 export const a = 1;

tests/baselines/reference/capturedLetConstInLoop4_ES6.js

@@ -144,7 +144,6 @@ for (const y = 0; y < 1;) {
 
 //// [capturedLetConstInLoop4_ES6.js]
 //======let
-//======let
 export function exportedFoo() {
     return v0 + v00 + v1 + v2 + v3 + v4 + v5 + v6 + v7 + v8;
 }