X87: Debugger: record reloc info for debug break slot immediate before the slot.

port 0a19e449 (r29568)

original commit message:

    If we do it too early, we might get a constant pool between the reloc info
    and the actual slot.

Review URL: https://codereview.chromium.org/1228923003

Cr-Commit-Position: refs/heads/master@{#29642}

src/x87/debug-x87.cc

@@ -157,10 +157,13 @@ void DebugCodegen::GenerateReturnDebugBreak(MacroAssembler* masm) {
 }
 
 
-void DebugCodegen::GenerateSlot(MacroAssembler* masm) {
+void DebugCodegen::GenerateSlot(MacroAssembler* masm,
+                                DebugCodegen::SlotLocation location,
+                                int call_argc) {
   // Generate enough nop's to make space for a call instruction.
   Label check_codesize;
   __ bind(&check_codesize);
+  RecordRelocInfo(masm, location, call_argc);
   __ Nop(Assembler::kDebugBreakSlotLength);
   DCHECK_EQ(Assembler::kDebugBreakSlotLength,
             masm->SizeOfCodeGeneratedSince(&check_codesize));