Reapply "Lazy deopt without code patching."

runtime/vm/flow_graph_compiler_arm.cc

Index: runtime/vm/flow_graph_compiler_arm.cc
diff --git a/runtime/vm/flow_graph_compiler_arm.cc b/runtime/vm/flow_graph_compiler_arm.cc
index 92c86301d458429673eacf8719216f1777bd94f1..65de695b245330142f79a7741ed06dfed27b0a4c 100644
--- a/runtime/vm/flow_graph_compiler_arm.cc
+++ b/runtime/vm/flow_graph_compiler_arm.cc
@@ -1112,21 +1112,6 @@ void FlowGraphCompiler::CompileGraph() {
   __ bkpt(0);
   ASSERT(assembler()->constant_pool_allowed());
   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::DeoptCallPatternLengthInInstructions();
-         ++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);
 }