[debugger] fix step-next for tail calls.

src/full-codegen/full-codegen.cc

Index: src/full-codegen/full-codegen.cc
diff --git a/src/full-codegen/full-codegen.cc b/src/full-codegen/full-codegen.cc
index 5aad3fd0603aa70d9bf0326d3937f008858c9bcb..4836f3b4a212ca33e4b83c1762587f4be60706e3 100644
--- a/src/full-codegen/full-codegen.cc
+++ b/src/full-codegen/full-codegen.cc
@@ -671,13 +671,16 @@ void FullCodeGenerator::SetExpressionAsStatementPosition(Expression* expr) {
   }
 }
 
-
-void FullCodeGenerator::SetCallPosition(Expression* expr) {
+void FullCodeGenerator::SetCallPosition(Expression* expr,
+                                        TailCallMode tail_call_mode) {
   if (expr->position() == RelocInfo::kNoPosition) return;
   RecordPosition(masm_, expr->position());
   if (info_->is_debug()) {
+    RelocInfo::Mode mode = (tail_call_mode == TailCallMode::kAllow)
+                               ? RelocInfo::DEBUG_BREAK_SLOT_AT_TAIL_CALL
+                               : RelocInfo::DEBUG_BREAK_SLOT_AT_CALL;
     // Always emit a debug break slot before a call.
-    DebugCodegen::GenerateSlot(masm_, RelocInfo::DEBUG_BREAK_SLOT_AT_CALL);
+    DebugCodegen::GenerateSlot(masm_, mode);
   }
 }