Revert "Lazy deopt without code patching."

runtime/vm/flow_graph_compiler_mips.cc

Index: runtime/vm/flow_graph_compiler_mips.cc
diff --git a/runtime/vm/flow_graph_compiler_mips.cc b/runtime/vm/flow_graph_compiler_mips.cc
index 155e7f418f252cf6896bb6047a6e480b6621ffba..4022d7c3625a0d11e8b5222eb3be9a5a7c3dbe97 100644
--- a/runtime/vm/flow_graph_compiler_mips.cc
+++ b/runtime/vm/flow_graph_compiler_mips.cc
@@ -1126,6 +1126,21 @@ void FlowGraphCompiler::CompileGraph() {
 
   __ break_(0);
   GenerateDeferredCode();
+
+  BeginCodeSourceRange();
+  if (is_optimizing() && !FLAG_precompiled_mode) {
+    // Leave enough space for patching in case of lazy deoptimization.
+    for (intptr_t i = 0;
+      i < CallPattern::kDeoptCallLengthInInstructions;
+      ++i) {
+      __ nop();
+    }
+    lazy_deopt_return_pc_offset_ = assembler()->CodeSize();
+    __ Branch(*StubCode::DeoptimizeLazyFromReturn_entry());
+    lazy_deopt_throw_pc_offset_ = assembler()->CodeSize();
+    __ Branch(*StubCode::DeoptimizeLazyFromThrow_entry());
+  }
+  EndCodeSourceRange(TokenPosition::kDartCodeEpilogue);
 }