Revert "Lazy deopt without code patching."

runtime/vm/intermediate_language_arm.cc

Index: runtime/vm/intermediate_language_arm.cc
diff --git a/runtime/vm/intermediate_language_arm.cc b/runtime/vm/intermediate_language_arm.cc
index fa3a2611b59a90b6971ed821e4a2d19fa2249e7c..9827a4da71857c8b0070209876bbd0ef815a55f1 100644
--- a/runtime/vm/intermediate_language_arm.cc
+++ b/runtime/vm/intermediate_language_arm.cc
@@ -2837,6 +2837,14 @@ 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::DeoptCallPatternLengthInInstructions();
+         ++i) {
+      __ nop();
+    }
+  }
   __ Bind(compiler->GetJumpLabel(this));
   compiler->AddExceptionHandler(catch_try_index(),
                                 try_index(),