Revert "Fix infinite loop (#63581)"

This reverts commit 637d574.

Author: liu-idf18

src/compiler/scanner.ts

@@ -3915,7 +3915,7 @@ export function createScanner(
 
         if (isIdentifierStart(ch, languageVersion)) {
             let char = ch;
-            while (pos < end && (isIdentifierPart(char = codePointUnchecked(pos), languageVersion) || char === CharacterCodes.minus)) pos += charSize(char);
+            while (pos < end && isIdentifierPart(char = codePointUnchecked(pos), languageVersion) || char === CharacterCodes.minus) pos += charSize(char);
             tokenValue = text.substring(tokenStart, pos);
             if (char === CharacterCodes.backslash) {
                 tokenValue += scanIdentifierParts();

src/testRunner/unittests/comments.ts

@@ -11,7 +11,6 @@ describe("comment parsing", () => {
     const withTrailing = `;/* comment */
 // another one
 `;
-    const endingInHyphen = "/**comment-*/";
     it("skips shebang", () => {
         const result = ts.getLeadingCommentRanges(withShebang, 0);
         assert.isDefined(result);
@@ -30,16 +29,4 @@ describe("comment parsing", () => {
         assert.strictEqual(result.length, 1);
         assert.strictEqual(result[0].kind, ts.SyntaxKind.SingleLineCommentTrivia);
     });
-
-    it("parses /** block comments ending in hyphen", () => {
-        const sourceFile = ts.createSourceFile(
-            "file.ts",
-            `${endingInHyphen}\nconst x = 1;`,
-            ts.ScriptTarget.ESNext,
-            /*setParentNodes*/ true,
-        );
-
-        assert.strictEqual(sourceFile.parseDiagnostics.length, 0);
-        assert.strictEqual(sourceFile.statements.length, 1);
-    });
 });