perf: reduce if statement call on " and \ (micro-optimization)

[cesco69]

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

benchmark with focus on small string
master

short string............................................. x 23,456,041 ops/sec ±0.52% (190 runs sampled)
short string with double quote........................... x 13,475,336 ops/sec ±0.55% (189 runs sampled)

PR

short string............................................. x 23,641,068 ops/sec ±0.57% (191 runs sampled)
short string with double quote........................... x 13,703,071 ops/sec ±0.43% (187 runs sampled)

Checklist

• run npm run test and npm run benchmark
• tests and/or benchmarks are included
• documentation is changed or added
• commit message and code follows the Developer's Certification of Origin
  and the Code of conduct

[mcollina]

lgtm