RFR: 8013155: [pack200] improve performance of pack200

[Kumar Srinivasan]

Hi Alex,

Great job identifying this hot method.  I realize the code is 
complicated but optimized
for speed.

Couple of nits:
I don't think you need the parens

j = (nextsemi < nextangl ? nextsemi : nextangl);

Coding conventions nits:
missing spaces for operators.

for (int i = firstl+1, j; i > 0; i = sig.indexOf('L', j)+1) {

I take it all the regression tests have been run ? in 
jdk/test/tools/pack200.

Thanks
Kumar


> Please review this fix which by fine-tuning of just one method gives 
> up to 40% performance
> improvement on packing and repacking of jar files.
> Also removed unneeded local variable initialization from Code class - 
> not for performance gain,
> just to make world a better place.
>
> http://cr.openjdk.java.net/~kizune/8013155/webrev.00