SI-6532 emit debug info in compiled java.

Our handful of java source files weren't being compiled
with line numbers, sourcefile, and other debugger aids.
I don't really know how to test this so I'll enclose an
excerpt of the bytecode diff of scala.runtime.IntRef to show
that this change results in debug information.

  2,3c2,4
  >   Compiled from "IntRef.java"
  4a6
  >   SourceFile: "IntRef.java"
  53a62,67
  >       LineNumberTable:
  >         line 18: 0
  >       LocalVariableTable:
  >         Start  Length  Slot  Name   Signature
  >                0      10     0  this   Lscala/runtime/IntRef;
  >                0      10     1  elem   I
  62a77,81
  >       LineNumberTable:
  >         line 19: 0
  >       LocalVariableTable:
  >         Start  Length  Slot  Name   Signature
  >                0       8     0  this   Lscala/runtime/IntRef;

1 files changed, 2 insertions, 0 deletions

diff --git a/build.xml b/build.xml
index 3ec3a3f827..f12b4e8dbe 100644
--- a/build.xml
+++ b/build.xml
@@ -772,6 +772,7 @@ TODO:
         <stopwatch name="@{project}.timer"/>
         <mkdir dir="${@{project}-classes}"/>
         <javac
+          debug="true"
           srcdir="${src.dir}/@{project}"
           destdir="${@{project}-classes}"
           classpath="${@{project}-classes}"
@@ -805,6 +806,7 @@ TODO:
 
     <sequential>
       <javac
+        debug="true"
         srcdir="${src.dir}/@{project}"
         destdir="${build-@{stage}.dir}/classes/@{destproject}"
         includes="**/*.java"