Reapply "Lazy deopt without code patching."

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 6ec28cc235628723a696208940624a4a5a1950f5..e69534353de961ceb4e86fffb43b2d3e31c08569 100644
--- a/runtime/vm/intermediate_language_mips.cc
+++ b/runtime/vm/intermediate_language_mips.cc
@@ -2668,14 +2668,6 @@ LocationSummary* CatchBlockEntryInstr::MakeLocationSummary(Zone* zone,
 
 
 void CatchBlockEntryInstr::EmitNativeCode(FlowGraphCompiler* compiler) {
-  // Ensure space for patching return sites for lazy deopt.
-  if (!FLAG_precompiled_mode && compiler->is_optimizing()) {
-    for (intptr_t i = 0;
-      i < CallPattern::kDeoptCallLengthInInstructions;
-      ++i) {
-      __ nop();
-    }
-  }
   __ Bind(compiler->GetJumpLabel(this));
   compiler->AddExceptionHandler(catch_try_index(),
                                 try_index(),