[antlr-interest] remove back track from compiler grammar

[Da Feng]

hello everyone:
I removed back track from openjdk project compiler grammer. Though performance 
is still significantly lower, the problem partly result from antlr lib loading. 
I did parse many files in a line, and result shows that only the first file 
suffers from large processing time. 




 
DaFENG
Coder
Telecommunication && Network Industry
Pudong
Shanghai
China