Sync with final ch21

Author: dibyendumajumdar

seaofnodes/src/test/java/com/compilerprogramming/ezlang/compiler/TestSONTypes.java

@@ -196,7 +196,7 @@ func foo()->Int {
 
         static void testCPU( String src, String cpu, String os, int spills, String stop ) {
         CodeGen code = new CodeGen(src);
-        code.parse().opto().typeCheck().instSelect(cpu,os).GCM().localSched().regAlloc().encode();
+        code.parse().opto().typeCheck().loopTree().instSelect(cpu,os).GCM().localSched().regAlloc().encode();
         int delta = spills>>3;
         if( delta==0 ) delta = 1;
         assertEquals("Expect spills:",spills,code._regAlloc._spillScaled,delta);