Disable loop invariant code motion on deoptimized functions.

runtime/vm/compiler.cc

Index: runtime/vm/compiler.cc
diff --git a/runtime/vm/compiler.cc b/runtime/vm/compiler.cc
index a0f1af74d99c0443e5a2587cfb35b43d225198ce..ffb8b8980f178e58f179c4fcbf93ff67f4ce9b7f 100644
--- a/runtime/vm/compiler.cc
+++ b/runtime/vm/compiler.cc
@@ -213,7 +213,8 @@ static bool CompileParsedFunctionHelper(const ParsedFunction& parsed_function,
         if (FLAG_common_subexpression_elimination) {
           DominatorBasedCSE::Optimize(flow_graph);
         }
-        if (FLAG_loop_invariant_code_motion) {
+        if (FLAG_loop_invariant_code_motion &&
+            parsed_function.function().deoptimization_counter() == 0) {

[Florian Schneider, 2012/09/24 11:08:50]

Since there could be other deoptimizations than those caused by code motion, I'd
rather write

parsed_function.function().deoptimization_counter() ==
FLAG_deoptimization_counter_threshold - 1 

to only disable it on the last re-compilation.

           LICM::Optimize(flow_graph);
         }