[regexp] fix bogus assertion in CharacterRange constructor.

src/regexp/regexp-ast.h

Index: src/regexp/regexp-ast.h
diff --git a/src/regexp/regexp-ast.h b/src/regexp/regexp-ast.h
index fbe9c750790efde25299766265c647d2d43ddbcc..0e718d3b4d15ecda1e6d56b3bc326ae5539a80e3 100644
--- a/src/regexp/regexp-ast.h
+++ b/src/regexp/regexp-ast.h
@@ -78,10 +78,6 @@ class CharacterRange {
   CharacterRange() : from_(0), to_(0) {}
   // For compatibility with the CHECK_OK macro
   CharacterRange(void* null) { DCHECK_NULL(null); }  // NOLINT
-  CharacterRange(uc32 from, uc32 to) : from_(from), to_(to) {
-    DCHECK(0 <= from && to <= String::kMaxCodePoint);
-    DCHECK(static_cast<uint32_t>(from) <= static_cast<uint32_t>(to));
-  }
   static void AddClassEscape(uc16 type, ZoneList<CharacterRange>* ranges,
                              Zone* zone);
   static Vector<const int> GetWordBounds();
@@ -89,6 +85,8 @@ class CharacterRange {
     return CharacterRange(value, value);
   }
   static inline CharacterRange Range(uc32 from, uc32 to) {
+    DCHECK(0 <= from && to <= String::kMaxCodePoint);
+    DCHECK(static_cast<uint32_t>(from) <= static_cast<uint32_t>(to));
     return CharacterRange(from, to);
   }
   static inline CharacterRange Everything() {
@@ -127,6 +125,8 @@ class CharacterRange {
   static const int kPayloadMask = (1 << 24) - 1;
 
  private:
+  CharacterRange(uc32 from, uc32 to) : from_(from), to_(to) {}
+
   uc32 from_;
   uc32 to_;
 };