RFR (XS) 8057845: ClassVerifier::verify_exception_handler_targets reconstructs the ExceptionTable in a loop

[harold seigel]

Hi,

Please review this small verifier performance improvement for bug 
JDK-8057845.  The change stops re-fetching the exception table for each 
loop iteration.  The re-fetching is no longer needed because Method no 
longer gets moved by gc.  This change noticeably improved Nashorn class 
loading.

bug:  https://bugs.openjdk.java.net/browse/JDK-8057845
Open webrev: http://cr.openjdk.java.net/~hseigel/bug_8057845/

The fix was tested with JCK lang, vm, and api/java_lang tests, ute quick 
tests, ute split_verifier tests, JPRT, and hotspot JTREG tests.

Thanks, Harold