Do not apply JS_RETURN and DEBUG_BREAK_SLOT relocations on x64.

src/x64/assembler-x64-inl.h

Index: src/x64/assembler-x64-inl.h
diff --git a/src/x64/assembler-x64-inl.h b/src/x64/assembler-x64-inl.h
index 01c60aaf0d334dfa13b43d1d231a59cea33acff2..c8abd22a63edfa7062c490172e5b2973c8352760 100644
--- a/src/x64/assembler-x64-inl.h
+++ b/src/x64/assembler-x64-inl.h
@@ -201,14 +201,6 @@ void RelocInfo::apply(intptr_t delta) {
     Memory::Address_at(pc_) += static_cast<int32_t>(delta);
   } else if (IsCodeTarget(rmode_)) {
     Memory::int32_at(pc_) -= static_cast<int32_t>(delta);
-  } else if (rmode_ == JS_RETURN && IsPatchedReturnSequence()) {
-    // Special handling of js_return when a break point is set (call
-    // instruction has been inserted).
-    Memory::int32_at(pc_ + 1) -= static_cast<int32_t>(delta);  // relocate entry
-  } else if (rmode_ == DEBUG_BREAK_SLOT && IsPatchedDebugBreakSlotSequence()) {
-    // Special handling of debug break slot when a break point is set (call
-    // instruction has been inserted).
-    Memory::int32_at(pc_ + 1) -= static_cast<int32_t>(delta);  // relocate entry
   }
 }
 
@@ -303,33 +295,34 @@ bool RelocInfo::IsPatchedDebugBreakSlotSequence() {
 
 
 Address RelocInfo::call_address() {
-  ASSERT(IsPatchedReturnSequence());
+  ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
+         (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
   return Memory::Address_at(
       pc_ + Assembler::kRealPatchReturnSequenceAddressOffset);
 }
 
 
 void RelocInfo::set_call_address(Address target) {
-  ASSERT(IsPatchedReturnSequence());
+  ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
+         (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
   Memory::Address_at(pc_ + Assembler::kRealPatchReturnSequenceAddressOffset) =
       target;
 }
 
 
 Object* RelocInfo::call_object() {
-  ASSERT(IsPatchedReturnSequence());
   return *call_object_address();
 }
 
 
 void RelocInfo::set_call_object(Object* target) {
-  ASSERT(IsPatchedReturnSequence());
   *call_object_address() = target;
 }
 
 
 Object** RelocInfo::call_object_address() {
-  ASSERT(IsPatchedReturnSequence());
+  ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
+         (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
   return reinterpret_cast<Object**>(
       pc_ + Assembler::kPatchReturnSequenceAddressOffset);
 }