Revert "[scanner] Micro-optimize AdvanceUntil"

This reverts commit bfc9eb2e.

Reason for revert: Micro-benchmark regressions (crbug.com/923823)

Original change's description:
> [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/1411351
> Reviewed-by: Toon Verwaest <verwaest@chromium.org>
> Commit-Queue: Leszek Swirski <leszeks@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#58846}

TBR=leszeks@chromium.org,verwaest@chromium.org

# Not skipping CQ checks because original CL landed > 1 day ago.
Bug: 923823

Change-Id: I2475e18fb1d52d47b32b34e261c6f1aa46b3c1ce
Reviewed-on: https://chromium-review.googlesource.com/c/1425200Reviewed-by: Leszek Swirski <leszeks@chromium.org>
Commit-Queue: Leszek Swirski <leszeks@chromium.org>
Cr-Commit-Position: refs/heads/master@{#58962}

src/parsing/scanner.h

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