Revert of [Interpreter] Adds support to fetch return value on break at return.

src/debug/x64/debug-x64.cc

Index: src/debug/x64/debug-x64.cc
diff --git a/src/debug/x64/debug-x64.cc b/src/debug/x64/debug-x64.cc
index 46805963220a9a65cab7ed48bc7aec27e1e70358..094e7b608ece3dc54ac5f1f708a057b62854a9cf 100644
--- a/src/debug/x64/debug-x64.cc
+++ b/src/debug/x64/debug-x64.cc
@@ -69,15 +69,9 @@
     }
     __ Push(Smi::FromInt(LiveEdit::kFramePaddingInitialSize));
 
-    // Push arguments for DebugBreak call.
-    if (mode == SAVE_RESULT_REGISTER) {
-      // Break on return.
-      __ Push(rax);
-    } else {
-      // Non-return breaks.
-      __ Push(masm->isolate()->factory()->the_hole_value());
-    }
-    __ Set(rax, 1);
+    if (mode == SAVE_RESULT_REGISTER) __ Push(rax);
+
+    __ Set(rax, 0);  // No arguments (argc == 0).
     __ Move(rbx, ExternalReference(Runtime::FunctionForId(Runtime::kDebugBreak),
                                    masm->isolate()));
 
@@ -87,13 +81,11 @@
     if (FLAG_debug_code) {
       for (int i = 0; i < kNumJSCallerSaved; ++i) {
         Register reg = {JSCallerSavedCode(i)};
-        // Do not clobber rax if SAVE_RESULT_REGISTER is set. It will
-        // contain return value of the function.
-        if (!(reg.is(rax) && SAVE_RESULT_REGISTER)) {
-          __ Set(reg, kDebugZapValue);
-        }
+        __ Set(reg, kDebugZapValue);
       }
     }
+
+    if (mode == SAVE_RESULT_REGISTER) __ Pop(rax);
 
     // Read current padding counter and skip corresponding number of words.
     __ Pop(kScratchRegister);