[Java] Clean-up TREE_OVERFLOW usage in the Java front-end

[Andrew Haley]

Roger Sayle writes:
 > 
 > This patch is a repost of the java front-end bits of my previous patch
 > http://gcc.gnu.org/ml/gcc-patches/2005-04/msg02412.html to clean-up
 > the use of TREE_OVERFLOW in the compiler.  Currently, TREE_OVERFLOW
 > is only ever set for constant class tree codes, such as INTEGER_CST.
 > By restricting the testing of TREE_OVERFLOW to the appropriate tree
 > nodes, we can introduce stricter checking in the middle-end.
 > 
 > 
 > The following patch has been tested on i686-pc-linux-gnu with a
 > full "make bootstrap", all default languages, and regression tested
 > with a top-level "make -k check" with no new failures.
 > 
 > Ok for mainline?
 > 
 > 
 > 2005-06-08  Roger Sayle  <roger@eyesopen.com>
 > 
 > 	* typeck.c (convert): Only clear TREE_OVERFLOW on INTEGER_CST nodes.

OK.

Andrew.