[scanner] Micro-optimize AdvanceUntil

Replace std::find_if in AdvanceUntil with a manual loop, which can
then return early, skipping the branch comparing to buffer_end_.

Change-Id: If49ed3667877751fcb0103a742750f03e5bd50db
Reviewed-on: https://chromium-review.googlesource.com/c/1411351Reviewed-by: Toon Verwaest <verwaest@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58846}

src/parsing/scanner.h

@@ -71,21 +71,18 @@ class Utf16CharacterStream {
   template <typename FunctionType>
   V8_INLINE uc32 AdvanceUntil(FunctionType check) {
     while (true) {
-      auto next_cursor_pos =
-          std::find_if(buffer_cursor_, buffer_end_, [&check](uint16_t raw_c0_) {
-            uc32 c0_ = static_cast<uc32>(raw_c0_);
-            return check(c0_);
-          });
-
-      if (next_cursor_pos == buffer_end_) {
-        buffer_cursor_ = buffer_end_;
-        if (!ReadBlockChecked()) {
+      for (; buffer_cursor_ < buffer_end_; ++buffer_cursor_) {
+        uc32 c0_ = static_cast<uc32>(*buffer_cursor_);
+        if (check(c0_)) {
           buffer_cursor_++;
-          return kEndOfInput;
+          return c0_;
         }
-      } else {
-        buffer_cursor_ = next_cursor_pos + 1;
-        return static_cast<uc32>(*next_cursor_pos);
+      }
+
+      DCHECK_EQ(buffer_cursor_, buffer_end_);
+      if (!ReadBlockChecked()) {
+        buffer_cursor_++;
+        return kEndOfInput;
       }
     }
   }