Optimization: Saves 30M instructions on x64 parsing ~6MB of JS code in parser-shell

src/parsing/expression-classifier.h

Index: src/parsing/expression-classifier.h
diff --git a/src/parsing/expression-classifier.h b/src/parsing/expression-classifier.h
index 3f70ed82d060965cce15739cb5f3cada9f204354..d3ac6daf97b935479129dc3978897c27c2fb44fa 100644
--- a/src/parsing/expression-classifier.h
+++ b/src/parsing/expression-classifier.h
@@ -17,16 +17,19 @@ template <typename Traits>
 class ExpressionClassifier {
  public:
   struct Error {
-    Error()
-        : location(Scanner::Location::invalid()),
-          message(MessageTemplate::kNone),
-          type(kSyntaxError),
-          arg(nullptr) {}
+    Error() { reset(); }
 
     Scanner::Location location;
     MessageTemplate::Template message : 30;
     ParseErrorType type : 2;
     const char* arg;
+
+    V8_INLINE void reset() {
+        location.beg_pos = location.end_pos = -1;
+        message = MessageTemplate::kNone;
+        type = kSyntaxError;
+        arg = nullptr;
+    }
   };
 
   enum TargetProduction {
@@ -320,12 +323,12 @@ class ExpressionClassifier {
 
   void ForgiveCoverInitializedNameError() {
     invalid_productions_ &= ~CoverInitializedNameProduction;
-    cover_initialized_name_error_ = Error();
+    cover_initialized_name_error_.reset();
   }
 
   void ForgiveAssignmentPatternError() {
     invalid_productions_ &= ~AssignmentPatternProduction;
-    assignment_pattern_error_ = Error();
+    assignment_pattern_error_.reset();
   }
 
   void Accumulate(ExpressionClassifier* inner,