chore(perf): reduce if statement call on " and \ (#695)

With this PR when a  `"` or `\` is into the string, the if statement for surrogate check is not called. This is a little performance improvment

Signed-off-by: francesco <francesco.bagnoli.69@gmail.com>

Author: cesco69

lib/serializer.js

@@ -128,17 +128,16 @@ module.exports = class Serializer {
     // eslint-disable-next-line
     for (var i = 0; i < len; i++) {
       point = str.charCodeAt(i)
-      if (point < 32 || (point >= 0xD800 && point <= 0xDFFF)) {
-        // The current character is non-printable characters or a surrogate.
-        return JSON.stringify(str)
-      }
       if (
         point === 0x22 || // '"'
         point === 0x5c // '\'
       ) {
         last === -1 && (last = 0)
         result += str.slice(last, i) + '\\'
         last = i
+      } else if (point < 32 || (point >= 0xD800 && point <= 0xDFFF)) {
+        // The current character is non-printable characters or a surrogate.
+        return JSON.stringify(str)
       }
     }