(cl) improve performance penalty of loading classes from CLASSPATH versus BOOTCLASSPATH

There is a significant performance penalty when classes are loaded
from the application classloader rather than from the BOOTCLASSPATH.

A microbenchmark measured 60% performance increase when loaded classes
were placed on the BOOTCLASSPATH.

A custom version of Netbeans 4.1 was measured to startup 12% faster when
all of it's classes were placed on the BOOTCLASSPATH.


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