Eliminate unnecessary deoptimization environments.

vm/flow_graph_compiler.cc

Index: vm/flow_graph_compiler.cc
===================================================================
--- vm/flow_graph_compiler.cc	(revision 10050)
+++ vm/flow_graph_compiler.cc	(working copy)
@@ -201,6 +201,7 @@
                                        Register reg3) {
   DeoptimizationStub* stub =
       new DeoptimizationStub(deopt_id, deopt_token_pos, try_index, reason);
+  ASSERT((pending_deoptimization_env_ != NULL) || !is_ssa_);

[srdjan, 2012/07/31 15:53:15]

Alternative would be to split this into two asserts and move them inside the
if-s

[Florian Schneider, 2012/08/01 11:46:36]

Done.

   if (pending_deoptimization_env_ == NULL) {
     frame_register_allocator()->SpillInDeoptStub(stub);
     if (reg1 != kNoRegister) stub->Push(reg1);