Pull in hack to reduce GC root ranges on Linux.

dnadlinger · dnadlinger · commit 8123c1c7b95e · 2013-05-19T20:52:26.000+02:00
GitHub: #233.
diff --git a/runtime/druntime b/runtime/druntime
@@ -1 +1 @@
-Subproject commit 7f74f0976b91a469726482e9973f35d6a164bf27
+Subproject commit 42620e900790bcbcf00411faa54a19c4731690fa
