[debugger] simplify reloc info for debug break slots.

src/debug/arm64/debug-arm64.cc

Index: src/debug/arm64/debug-arm64.cc
diff --git a/src/debug/arm64/debug-arm64.cc b/src/debug/arm64/debug-arm64.cc
index 2600fca8186855f44d43dbc0d624a922dc358f98..599815bf540cf8d9837575669c901a4e93d0735a 100644
--- a/src/debug/arm64/debug-arm64.cc
+++ b/src/debug/arm64/debug-arm64.cc
@@ -25,12 +25,11 @@ void EmitDebugBreakSlot(Assembler* masm) {
 }
 
 
-void DebugCodegen::GenerateSlot(MacroAssembler* masm, RelocInfo::Mode mode,
-                                int call_argc) {
+void DebugCodegen::GenerateSlot(MacroAssembler* masm, RelocInfo::Mode mode) {
   // Generate enough nop's to make space for a call instruction. Avoid emitting
   // the constant pool in the debug break slot code.
   InstructionAccurateScope scope(masm, Assembler::kDebugBreakSlotInstructions);
-  masm->RecordDebugBreakSlot(mode, call_argc);
+  masm->RecordDebugBreakSlot(mode);
   EmitDebugBreakSlot(masm);
 }