Revert r10118 from bleeding edge.

src/x64/lithium-codegen-x64.cc

Index: src/x64/lithium-codegen-x64.cc
===================================================================
--- src/x64/lithium-codegen-x64.cc	(revision 10131)
+++ src/x64/lithium-codegen-x64.cc	(working copy)
@@ -4263,21 +4263,38 @@
     LStackCheck* instr_;
   };
 
-  DeferredStackCheck* deferred_stack_check =
-      new DeferredStackCheck(this, instr);
-  __ CompareRoot(rsp, Heap::kStackLimitRootIndex);
-  __ j(below, deferred_stack_check->entry());
-  EnsureSpaceForLazyDeopt(Deoptimizer::patch_size());
-  __ bind(instr->done_label());
-  deferred_stack_check->SetExit(instr->done_label());
+  ASSERT(instr->HasEnvironment());
+  LEnvironment* env = instr->environment();
   // There is no LLazyBailout instruction for stack-checks. We have to
   // prepare for lazy deoptimization explicitly here.
-  ASSERT(instr->HasEnvironment());
-  LEnvironment* env = instr->environment();
-  RegisterEnvironmentForDeoptimization(env, Safepoint::kLazyDeopt);
-  // Don't record a deoptimization index for the safepoint here.
-  // This will be done explicitly when emitting call and the safepoint in
-  // the deferred code.
+  if (instr->hydrogen()->is_function_entry()) {
+    // Perform stack overflow check.
+    Label done;
+    __ CompareRoot(rsp, Heap::kStackLimitRootIndex);
+    __ j(above_equal, &done, Label::kNear);
+    StackCheckStub stub;
+    CallCode(stub.GetCode(), RelocInfo::CODE_TARGET, instr);
+    EnsureSpaceForLazyDeopt(Deoptimizer::patch_size());
+    last_lazy_deopt_pc_ = masm()->pc_offset();
+    __ bind(&done);
+    RegisterEnvironmentForDeoptimization(env, Safepoint::kLazyDeopt);
+    safepoints_.RecordLazyDeoptimizationIndex(env->deoptimization_index());
+  } else {
+    ASSERT(instr->hydrogen()->is_backwards_branch());
+    // Perform stack overflow check if this goto needs it before jumping.
+    DeferredStackCheck* deferred_stack_check =
+        new DeferredStackCheck(this, instr);
+    __ CompareRoot(rsp, Heap::kStackLimitRootIndex);
+    __ j(below, deferred_stack_check->entry());
+    EnsureSpaceForLazyDeopt(Deoptimizer::patch_size());
+    last_lazy_deopt_pc_ = masm()->pc_offset();
+    __ bind(instr->done_label());
+    deferred_stack_check->SetExit(instr->done_label());
+    RegisterEnvironmentForDeoptimization(env, Safepoint::kLazyDeopt);
+    // Don't record a deoptimization index for the safepoint here.
+    // This will be done explicitly when emitting call and the safepoint in
+    // the deferred code.
+  }
 }