RFR 8232890: Remove bad Code attribute parsing code

[Harold Seigel]

Hi,

Please review this JDK-14 fix to remove obsolete parsing of the first 
few fields of the method Code attribute.  Details are in the bug.

Open Webrev: http://cr.openjdk.java.net/~hseigel/bug_8232890/webrev/

JBS Bug: https://bugs.openjdk.java.net/browse/JDK-8232890

The fix was regression tested by running Mach5 tiers 1 and 2 tests and 
builds on Linux-x64, Solaris, Windows, and Mac OS X, by running Mach5 
tiers 3-5 tests on Linux-x64, and JCK lang and VM tests on Linux-x64.

Thanks, Harold