Jaxb 2.3.3 performance regression impact JBoss EAP 7.2

Issue

• Jboss 7.2.6 vs 7.2.8 Performance Drop by 50%, see table below:

### JDK 11 and noOptimization=false ###
Running 2m test @ http://localhost:8080/jaxb233/performance
  30 threads and 30 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency   118.90ms   73.61ms   1.20s    89.70%
    Req/Sec     9.24      3.98    40.00     71.58%
  31534 requests in 2.00m, 1.10GB read
Requests/sec:    262.61
Transfer/sec:      9.35MB

### JDK11 and noOptimization=true ###
Running 2m test @ http://localhost:8080/jaxb233/performance
  30 threads and 30 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency   122.48ms   49.19ms 560.53ms   69.79%
    Req/Sec     8.54      3.59    40.00     71.62%
  29509 requests in 2.00m, 1.03GB read
Requests/sec:    245.71
Transfer/sec:      8.74MB

### JDK8 and noOptimization=false ###
Running 2m test @ http://localhost:8080/jaxb233/performance
  30 threads and 30 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency     1.06s   134.33ms   1.61s    74.87%
    Req/Sec     0.25      0.43     1.00     75.16%
  3341 requests in 2.00m, 118.89MB read
  Socket errors: connect 0, read 0, write 0, timeout 30
Requests/sec:     27.83
Transfer/sec:      0.99MB

### JDK8 and noOptimization=true ###
Running 2m test @ http://localhost:8080/jaxb233/performance
  30 threads and 30 connections
  Thread Stats   Avg      Stdev     Max   +/- Stdev
    Latency   153.22ms  125.08ms   1.58s    95.02%
    Req/Sec     7.70      3.71    39.00     91.13%
  25424 requests in 2.00m, 0.88GB read