X87: [debugger] Remove code to predict step-in target.

  port 2f559f21 (r32449)

  original commit message:

BUG=

Review URL: https://codereview.chromium.org/1494453002

Cr-Commit-Position: refs/heads/master@{#32487}

src/x87/macro-assembler-x87.cc

@@ -1953,11 +1953,10 @@ void MacroAssembler::FloodFunctionIfStepping(Register fun, Register new_target,
                                              const ParameterCount& expected,
                                              const ParameterCount& actual) {
   Label skip_flooding;
-  ExternalReference debug_step_action =
-      ExternalReference::debug_last_step_action_address(isolate());
-  cmpb(Operand::StaticVariable(debug_step_action), StepIn);
-  STATIC_ASSERT(StepFrame > StepIn);
-  j(less, &skip_flooding);
+  ExternalReference step_in_enabled =
+      ExternalReference::debug_step_in_enabled_address(isolate());
+  cmpb(Operand::StaticVariable(step_in_enabled), 0);
+  j(equal, &skip_flooding);
   {
     FrameScope frame(this,
                      has_frame() ? StackFrame::NONE : StackFrame::INTERNAL);