update to latest graal

com.oracle.truffle.r.nodes/src/com/oracle/truffle/r/nodes/builtin/debug/DebugCompileBuiltin.java

@@ -41,7 +41,7 @@ public abstract class DebugCompileBuiltin extends RBuiltinNode {
 
         private Compiler() {
             try {
-                optimizedCallTarget = Class.forName("com.oracle.graal.truffle.OptimizedCallTarget");
+                optimizedCallTarget = Class.forName("com.oracle.graal.truffle.OptimizedCallTarget", false, Truffle.getRuntime().getClass().getClassLoader());
                 compileMethod = optimizedCallTarget.getDeclaredMethod("compile");
             } catch (ClassNotFoundException | IllegalArgumentException | NoSuchMethodException | SecurityException e) {
                 Utils.fail("DebugCompileBuiltin failed to find compile method");

mx.fastr/imports

-graal,addc0564e5b5ba6b3e649115bd25f5d1127ee436,http://hg.openjdk.java.net/graal/graal
+graal,74123ce7599b68e771c03d7a80d9d09a598145d2,http://hg.openjdk.java.net/graal/graal