[parser/test] Move cctest/PreParserScopeAnalysis into a new file.

test/cctest/unicode-helpers.h

+// Copyright 2017 the V8 project authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef V8_CCTEST_UNICODE_HELPERS_H_
+#define V8_CCTEST_UNICODE_HELPERS_H_
+
+#include "src/unicode.h"
+
+static int Ucs2CharLength(unibrow::uchar c) {
+  if (c == unibrow::Utf8::kIncomplete || c == unibrow::Utf8::kBufferEmpty) {
+    return 0;
+  } else if (c < 0xffff) {
+    return 1;
+  } else {
+    return 2;
+  }
+}
+
+static int Utf8LengthHelper(const char* s) {
+  unibrow::Utf8::Utf8IncrementalBuffer buffer(unibrow::Utf8::kBufferEmpty);
+  int length = 0;
+  for (; *s != '\0'; s++) {
+    unibrow::uchar tmp = unibrow::Utf8::ValueOfIncremental(*s, &buffer);
+    length += Ucs2CharLength(tmp);
+  }
+  unibrow::uchar tmp = unibrow::Utf8::ValueOfIncrementalFinish(&buffer);
+  length += Ucs2CharLength(tmp);
+  return length;
+}
+
+#endif  // V8_CCTEST_UNICODE_HELPERS_H_