Update identifier syntax to disallow U+2E2F

src/char-predicates.h

Index: src/char-predicates.h
diff --git a/src/char-predicates.h b/src/char-predicates.h
index b7c5d42320fc953c1744016f39a846e4eb1bb978..c7435a2b3507d6ec4a3000e63257668ebd3b2b6d 100644
--- a/src/char-predicates.h
+++ b/src/char-predicates.h
@@ -26,6 +26,8 @@ struct IdentifierStart {
   static inline bool Is(uc32 c) {
     switch (c) {
       case '$': case '_': case '\\': return true;
+      case 0x2e2f:
+        return false;  // U+2E2F is Vertical tilde.
       default: return unibrow::Letter::Is(c);
     }
   }
@@ -34,6 +36,7 @@ struct IdentifierStart {
 
 struct IdentifierPart {
   static inline bool Is(uc32 c) {
+    if (c == 0x2e2f) return false;  // U+2E2F is Vertical tilde.
     return IdentifierStart::Is(c)
         || unibrow::Number::Is(c)
         || c == 0x200C  // U+200C is Zero-Width Non-Joiner.