dart2js: Initial implementation of inlining.

pkg/compiler/lib/src/cps_ir/shrinking_reductions.dart

Index: pkg/compiler/lib/src/cps_ir/shrinking_reductions.dart
diff --git a/pkg/compiler/lib/src/cps_ir/shrinking_reductions.dart b/pkg/compiler/lib/src/cps_ir/shrinking_reductions.dart
index 422db14ac1ace1f90c0a3d38c4695e691e328a81..f7365b44e731ae5b3ff18cb30d9681d887f5e78d 100644
--- a/pkg/compiler/lib/src/cps_ir/shrinking_reductions.dart
+++ b/pkg/compiler/lib/src/cps_ir/shrinking_reductions.dart
@@ -166,6 +166,17 @@ class ShrinkingReducer extends Pass {
     InvokeContinuation invoke = cont.body;
     Continuation wrappedCont = invoke.continuation.definition;
 
+    // If the invocation of wrappedCont is escaping, then all invocations of
+    // cont will be as well, after the reduction.
+    if (invoke.isEscapingTry) {
+      Reference current = cont.firstRef;
+      while (current != null) {
+        InvokeContinuation owner = current.parent;
+        owner.isEscapingTry = true;
+        current = current.next;
+      }
+    }
+
     // Replace all occurrences with the wrapped continuation.
     cont.replaceUsesWith(wrappedCont);