D2 changes!

Removed druntime from the repository again.. Sorry :/
Updated the druntime port a bit, now requires druntime from trunk.
Added info in runtime/README on how to get druntime from trunk.
Added patch to add LDC support to druntime.
Removed some debug logging from D2 builds.
Fixed broken typeinfo for const/invariant in D2.

runtime/README

@@ -1,3 +1,5 @@
+FOR D1:
+=======
 1) Do a checkout of tango trunk in the ldc root dir (along dmd, gen, runtime etc).
 
     *    svn co http://svn.dsource.org/projects/tango/trunk ../tango
@@ -9,3 +11,22 @@
 3) Compile the runtime
 
     *    sh build.sh
+
+FOR D2:
+=======
+Highly experimental!!!
+
+1) Do a checkout of druntime trunk in the ldc root dir (along dmd, gen, runtime etc).
+
+    *    svn co http://svn.dsource.org/projects/druntime/trunk ../druntime
+
+2) Patch druntime
+
+    *    sh patch-druntime.sh
+
+3) Compile druntime
+
+    *    cd ../druntime/src
+    *    sh build-ldc.sh
+
+Enjoy!