revert change of trailing comment parsing

Author: ajafff

src/compiler/scanner.ts

@@ -664,9 +664,6 @@ namespace ts {
         let collecting = trailing;
         let accumulator = initial;
         if (pos === 0) {
-            if (collecting) {
-                return accumulator;
-            }
             collecting = true;
             const shebang = getShebang(text);
             if (shebang) {

src/testRunner/unittests/comments.ts

@@ -28,22 +28,5 @@ namespace ts {
             assert.strictEqual(result!.length, 1);
             assert.strictEqual(result![0].kind, SyntaxKind.SingleLineCommentTrivia);
         });
-
-        it("returns no trailing comments at start of file", () => {
-            const result = getTrailingCommentRanges(noShebang, 0);
-            assert.isUndefined(result);
-        });
-
-        it("returns no trailing comments at start of file if shebang is present", () => {
-            const result = getTrailingCommentRanges(withShebang, 0);
-            assert.isUndefined(result);
-        });
-
-        it("returns trailing comments if position is not 0", () => {
-            const result = getTrailingCommentRanges(withTrailing, 1);
-            assert.isDefined(result);
-            assert.strictEqual(result!.length, 1);
-            assert.strictEqual(result![0].kind, SyntaxKind.MultiLineCommentTrivia);
-        });
     });
 }