[debugger] simplify reloc info for debug break slots.

src/debug/mips64/debug-mips64.cc

Index: src/debug/mips64/debug-mips64.cc
diff --git a/src/debug/mips64/debug-mips64.cc b/src/debug/mips64/debug-mips64.cc
index 5c1bb3e963a8095e6b5e5aa39807bad2fcbf036c..49bbf3bf8ca52c5570e5d70c67513b159a58b56e 100644
--- a/src/debug/mips64/debug-mips64.cc
+++ b/src/debug/mips64/debug-mips64.cc
@@ -23,12 +23,11 @@ void EmitDebugBreakSlot(MacroAssembler* 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 trampoline pool in the debug break slot code.
   Assembler::BlockTrampolinePoolScope block_pool(masm);
-  masm->RecordDebugBreakSlot(mode, call_argc);
+  masm->RecordDebugBreakSlot(mode);
   EmitDebugBreakSlot(masm);
 }