[parser] Move Token::NEW parsing into the switch of ParsePrimaryExpression

All uses of ParseMemberExpression go through
ParseMemberWithNewPrefixesExpression, and ParseMemberExpression always starts
with ParsePrimaryExprssion, so we can simply move Token::NEW handling into
ParsePrimaryExpression. That avoids an unnecessary branch on the hot path.

Change-Id: I2bcce8e106c547c6d308ee6b0fce8747c7214886
Reviewed-on: https://chromium-review.googlesource.com/c/1485838Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Toon Verwaest <verwaest@chromium.org>
Cr-Commit-Position: refs/heads/master@{#59827}

src/parsing/parser-base.h

@@ -1059,7 +1059,6 @@ class ParserBase {
   V8_INLINE ExpressionT ParseLeftHandSideExpression();
   ExpressionT ParseLeftHandSideContinuation(ExpressionT expression);
   ExpressionT ParseMemberWithPresentNewPrefixesExpression();
-  V8_INLINE ExpressionT ParseMemberWithNewPrefixesExpression();
   ExpressionT ParseFunctionExpression();
   V8_INLINE ExpressionT ParseMemberExpression();
   V8_INLINE ExpressionT
@@ -1705,6 +1704,9 @@ ParserBase<Impl>::ParsePrimaryExpression() {
   }
 
   switch (token) {
+    case Token::NEW:
+      return ParseMemberWithPresentNewPrefixesExpression();
+
     case Token::THIS: {
       Consume(Token::THIS);
       return impl()->ThisExpression();
@@ -3026,7 +3028,7 @@ ParserBase<Impl>::ParseLeftHandSideExpression() {
   // LeftHandSideExpression ::
   //   (NewExpression | MemberExpression) ...
 
-  ExpressionT result = ParseMemberWithNewPrefixesExpression();
+  ExpressionT result = ParseMemberExpression();
   if (!Token::IsPropertyOrCall(peek())) return result;
   return ParseLeftHandSideContinuation(result);
 }
@@ -3196,7 +3198,7 @@ ParserBase<Impl>::ParseMemberWithPresentNewPrefixesExpression() {
     result = ParseNewTargetExpression();
     return ParseMemberExpressionContinuation(result);
   } else {
-    result = ParseMemberWithNewPrefixesExpression();
+    result = ParseMemberExpression();
   }
   if (peek() == Token::LPAREN) {
     // NewExpression with arguments.
@@ -3219,13 +3221,6 @@ ParserBase<Impl>::ParseMemberWithPresentNewPrefixesExpression() {
   return factory()->NewCallNew(result, args, new_pos);
 }
 
-template <typename Impl>
-typename ParserBase<Impl>::ExpressionT
-ParserBase<Impl>::ParseMemberWithNewPrefixesExpression() {
-  return peek() == Token::NEW ? ParseMemberWithPresentNewPrefixesExpression()
-                              : ParseMemberExpression();
-}
-
 template <typename Impl>
 typename ParserBase<Impl>::ExpressionT
 ParserBase<Impl>::ParseFunctionExpression() {