[debugger] Remove code to predict step-in target.

src/x87/macro-assembler-x87.cc

Index: src/x87/macro-assembler-x87.cc
diff --git a/src/x87/macro-assembler-x87.cc b/src/x87/macro-assembler-x87.cc
index 0b28c64512cb9226b3da7647b09b8b5189834734..89059b0d54105414f8877cd41c66d1de4357bafe 100644
--- a/src/x87/macro-assembler-x87.cc
+++ b/src/x87/macro-assembler-x87.cc
@@ -1959,7 +1959,8 @@ void MacroAssembler::FloodFunctionIfStepping(Register fun, Register new_target,
   ExternalReference debug_step_action =
       ExternalReference::debug_last_step_action_address(isolate());
   cmpb(Operand::StaticVariable(debug_step_action), StepIn);
-  j(not_equal, &skip_flooding);
+  STATIC_ASSERT(StepFrame > StepIn);
+  j(less, &skip_flooding);
   {
     FrameScope frame(this,
                      has_frame() ? StackFrame::NONE : StackFrame::INTERNAL);