Please review 7112160

[Kumar Srinivasan]

Hi,

Here is a tiny change to increase the heap space for javadoc, during the
jdk build,  this allows the build to complete and speeds up the build as 
well.

fyi. The heap space was on the borderline of  running out of heap and cause
an OOM,  some recent changes  have increased the memory requirement,
and tipped the scale over.

http://cr.openjdk.java.net/~ksrini/7112160/

Thanks
Kumar