[parser] Simplify ParseIdentifier

ParseAndClassifyIdentifier cannot result in invalid assignment patterns, so
don't check for them.

Change-Id: I038c651502e10d17b2da1c21527ef1b9e4cd16ea
Reviewed-on: https://chromium-review.googlesource.com/c/1270916
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Reviewed-by: Igor Sheludko <ishell@chromium.org>
Cr-Commit-Position: refs/heads/master@{#56489}

src/parsing/parser-base.h

@@ -1673,7 +1673,6 @@ typename ParserBase<Impl>::IdentifierT ParserBase<Impl>::ParseIdentifier(
   auto result = ParseAndClassifyIdentifier(CHECK_OK_CUSTOM(NullIdentifier));
 
   if (allow_restricted_identifiers == kDontAllowRestrictedIdentifiers) {
-    ValidateAssignmentPattern(CHECK_OK_CUSTOM(NullIdentifier));
     ValidateBindingPattern(CHECK_OK_CUSTOM(NullIdentifier));
   }