Do not emit duplicate deoptimization entries for GotoInstr.

runtime/vm/intermediate_language_x64.cc

Index: runtime/vm/intermediate_language_x64.cc
diff --git a/runtime/vm/intermediate_language_x64.cc b/runtime/vm/intermediate_language_x64.cc
index 7c2cfe708b90468e3eef518e84d1ea6aab3731d0..b17fe351db4c4ee9041003924748cf9610248399 100644
--- a/runtime/vm/intermediate_language_x64.cc
+++ b/runtime/vm/intermediate_language_x64.cc
@@ -4086,14 +4086,6 @@ LocationSummary* GotoInstr::MakeLocationSummary() const {
 
 
 void GotoInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
-  if (!compiler->is_optimizing()) {
-    // Add deoptimization descriptor for deoptimizing instructions that may
-    // be inserted before this instruction.
-    compiler->AddCurrentDescriptor(PcDescriptors::kDeopt,
-                                   GetDeoptId(),
-                                   0);  // No token position.
-  }
-
   if (HasParallelMove()) {
     compiler->parallel_move_resolver()->EmitNativeCode(parallel_move());
   }