Remove hack around aborting loop body in the case of for loops and while loops.

sdk/lib/_internal/compiler/implementation/ssa/variable_allocator.dart

Index: sdk/lib/_internal/compiler/implementation/ssa/variable_allocator.dart
===================================================================
--- sdk/lib/_internal/compiler/implementation/ssa/variable_allocator.dart	(revision 14539)
+++ sdk/lib/_internal/compiler/implementation/ssa/variable_allocator.dart	(working copy)
@@ -295,6 +295,11 @@
   void updateLoopMarker(HBasicBlock header) {
     LiveEnvironment env = liveInstructions[header];
     int lastId = env.loopMarkers[header];
+    if (lastId == null) {
+      assert(header.predecessors.length == 1);

[floitsch, 2012/11/05 17:36:09]

add comment what happened.

[ngeoffray, 2012/11/06 08:55:27]

I changed the code to not enter updateLoopMarker in case the loop header does
not have back edge. And added a comment there.

+      return;
+    }
+
     // Update all instructions that are liveIns in [header] to have a
     // range that covers the loop.
     env.liveInstructions.forEach((HInstruction instruction, int id) {