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