Revert "Lazy deopt without code patching."

runtime/vm/flow_graph_compiler_ia32.cc

Index: runtime/vm/flow_graph_compiler_ia32.cc
diff --git a/runtime/vm/flow_graph_compiler_ia32.cc b/runtime/vm/flow_graph_compiler_ia32.cc
index be480f1adad14d8934b64d4db6e6032c0e85a1dd..36c4a175b29656ca542ca3ab27028f90f1937dab 100644
--- a/runtime/vm/flow_graph_compiler_ia32.cc
+++ b/runtime/vm/flow_graph_compiler_ia32.cc
@@ -1123,6 +1123,17 @@ void FlowGraphCompiler::CompileGraph() {
 
   __ int3();
   GenerateDeferredCode();
+
+  BeginCodeSourceRange();
+  if (is_optimizing() && !FLAG_precompiled_mode) {
+    // Leave enough space for patching in case of lazy deoptimization.
+    __ nop(CallPattern::pattern_length_in_bytes());
+    lazy_deopt_return_pc_offset_ = assembler()->CodeSize();
+    __ Jmp(*StubCode::DeoptimizeLazyFromReturn_entry());
+    lazy_deopt_throw_pc_offset_ = assembler()->CodeSize();
+    __ Jmp(*StubCode::DeoptimizeLazyFromThrow_entry());
+  }
+  EndCodeSourceRange(TokenPosition::kDartCodeEpilogue);
 }