Emit kDeoptBefore only in unoptimzied code (target when switching from optimized to unoptimized cod…

runtime/vm/intermediate_language_ia32.cc

Index: runtime/vm/intermediate_language_ia32.cc
===================================================================
--- runtime/vm/intermediate_language_ia32.cc	(revision 12803)
+++ runtime/vm/intermediate_language_ia32.cc	(working copy)
@@ -315,9 +315,11 @@
                                        intptr_t token_pos,
                                        Token::Kind kind,
                                        LocationSummary* locs) {
-  compiler->AddCurrentDescriptor(PcDescriptors::kDeoptBefore,
-                                 deopt_id,
-                                 token_pos);
+  if (!compiler->is_optimizing()) {
+    compiler->AddCurrentDescriptor(PcDescriptors::kDeoptBefore,
+                                   deopt_id,
+                                   token_pos);
+  }
   const String& operator_name = String::ZoneHandle(Symbols::New("=="));
   const int kNumberOfArguments = 2;
   const Array& kNoArgumentNames = Array::Handle();
@@ -791,9 +793,11 @@
   }
   const String& function_name =
       String::ZoneHandle(Symbols::New(Token::Str(kind())));
-  compiler->AddCurrentDescriptor(PcDescriptors::kDeoptBefore,
-                                 deopt_id(),
-                                 token_pos());
+  if (!compiler->is_optimizing()) {
+    compiler->AddCurrentDescriptor(PcDescriptors::kDeoptBefore,
+                                   deopt_id(),
+                                   token_pos());
+  }
   const intptr_t kNumArguments = 2;
   const intptr_t kNumArgsChecked = 2;  // Type-feedback.
   compiler->GenerateInstanceCall(deopt_id(),