dart2js cps: Do not count no-check bounds checks in size visitor.

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

Index: pkg/compiler/lib/src/cps_ir/inline.dart
diff --git a/pkg/compiler/lib/src/cps_ir/inline.dart b/pkg/compiler/lib/src/cps_ir/inline.dart
index 972241e138952849eef411d0f1d7e0d3dda025be..87892d3a1fe888ce912bfbe58baa9ef96d9bd7d7 100644
--- a/pkg/compiler/lib/src/cps_ir/inline.dart
+++ b/pkg/compiler/lib/src/cps_ir/inline.dart
@@ -246,15 +246,19 @@ class SizeVisitor extends TrampolineRecursiveVisitor {
   // Inlining a function incurs a cost equal to the number of primitives and
   // non-jump tail expressions.
   // TODO(kmillikin): Tune the size computation and size bound.
-  processLetPrim(LetPrim node) {
-    if (node.primitive is! Refinement) {
-      ++size;
-    }
-  }
+  processLetPrim(LetPrim node) => ++size;
   processLetMutable(LetMutable node) => ++size;
   processBranch(Branch node) => ++size;
   processThrow(Throw nose) => ++size;
   processRethrow(Rethrow node) => ++size;
+
+  // Discount primitives that do not generate code.
+  processRefinement(Refinement node) => --size;
+  processBoundsCheck(BoundsCheck node) {
+    if (node.hasNoChecks) {
+      --size;
+    }
+  }
 }
 
 class InliningVisitor extends TrampolineRecursiveVisitor {