test/fuzz: speedup string serialization

- clamp before cleaning string because cleaning is not cheap
  (O(n), where max n is equal to kMaxStrLength)
- call cleaning for identifiers only, there is no sense to
  cleaning string literals
- replace symbols disallowed by Lua grammar in indentifier's
  names with '_'

The patch saves 16 sec on 145k samples (401 sec before the patch
and 385 sec after the patch). It is actually not so much, but it
is about 2.5 min per hour.

NO_CHANGELOG=testing
NO_DOC=testing

test/fuzz/luaL_loadbuffer/serializer.cc

@@ -435,6 +435,8 @@ ClearIdentifier(const std::string &identifier)
 		} else if (std::isalpha(c) || c == '_') {
 			has_first_not_digit = true;
 			cleared += c;
+		} else {
+			cleared += '_';
 		}
 	}
 	return cleared;
@@ -456,12 +458,13 @@ clamp(double number, double upper, double lower)
 }
 
 inline std::string
-ConvertToStringDefault(const std::string &s)
+ConvertToStringDefault(const std::string &s, bool sanitize = false)
 {
-	std::string ident = ClearIdentifier(s);
-	ident = clamp(ident);
+	std::string ident = clamp(s);
+	if (sanitize)
+		ident = ClearIdentifier(ident);
 	if (ident.empty())
-		return std::string(kDefaultIdent);
+		ident = std::string(kDefaultIdent);
 	return ident;
 }
 
@@ -951,7 +954,7 @@ NESTED_PROTO_TOSTRING(IndexWithName, indexname, Variable)
 {
 	std::string indexname_str = PrefixExpressionToString(
 		indexname.prefixexp());
-	std::string idx_str = ConvertToStringDefault(indexname.name());
+	std::string idx_str = ConvertToStringDefault(indexname.name(), true);
 	/* Prevent using reserved keywords as indices. */
 	if (KReservedLuaKeywords.find(idx_str) != KReservedLuaKeywords.end()) {
 		idx_str += "_1";
@@ -1196,8 +1199,12 @@ PROTO_TOSTRING(UnaryOperator, op)
  */
 PROTO_TOSTRING(Name, name)
 {
-	std::string ident = ConvertToStringDefault(name.name());
-	return ident + std::to_string(name.num() % kMaxIdentifiers);
+	std::string ident = ConvertToStringDefault(name.name(), true);
+	/* Identifier has default name, add an index. */
+	if (!ident.compare(kDefaultIdent)) {
+		ident += std::to_string(name.num() % kMaxIdentifiers);
+	}
+	return ident;
 }
 
 } /* namespace */