Do not emit duplicate deoptimization entries for GotoInstr.

runtime/vm/intermediate_language_mips.cc

Index: runtime/vm/intermediate_language_mips.cc
diff --git a/runtime/vm/intermediate_language_mips.cc b/runtime/vm/intermediate_language_mips.cc
index f2178d79306dbe1a56118f3d70d11e060285bb99..5610b8bb5f7b3a0b97c00f83f2c69214508a5c46 100644
--- a/runtime/vm/intermediate_language_mips.cc
+++ b/runtime/vm/intermediate_language_mips.cc
@@ -2707,14 +2707,6 @@ LocationSummary* GotoInstr::MakeLocationSummary() const {
 
 void GotoInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
   __ TraceSimMsg("GotoInstr");
-  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());
   }