reduce memory for javadoc

[Jonathan Gibbons]

Build folk,

As a result of these two changesets now in tl/langtools, we can now 
reduce the memory requirements for javadoc in 
(root)common/makefiles/javadoc/Javadoc.gmk.

changeset:   1678:3f3cc8d3f13c
tag:         tip
user:        jjg
date:        Mon Apr 08 11:57:37 2013 -0700
summary:     8011677: EndPosTables should avoid hidden references to Parser

changeset:   1677:b402b93cbe38
user:        jjg
date:        Mon Apr 08 11:54:26 2013 -0700
summary:     8011676: Instances of Tokens.Comment should not be defined 
in inner classes


I have done builds with the memory limited to 512m, down from 1024m.  I 
did try further, with 384m, but that was too much of a reduction.

$ hg diff
diff -r 11c057460b91 common/makefiles/javadoc/Javadoc.gmk
--- a/common/makefiles/javadoc/Javadoc.gmk    Fri Apr 05 14:49:54 2013 -0700
+++ b/common/makefiles/javadoc/Javadoc.gmk    Tue Apr 09 18:42:37 2013 -0700
@@ -47,7 +47,7 @@
  BUILD_NUMBER=$(JDK_BUILD_NUMBER)

  JAVADOC_CMD = $(JAVA) \
-              -Xmx1024m \
+              -Xmx512m \
            -Djava.awt.headless=true \
            $(NEW_JAVADOC) \
            -bootclasspath $(JDK_OUTPUTDIR)/classes

-- Jon