Do not apply JS_RETURN and DEBUG_BREAK_SLOT relocations on x64.

src/arm/assembler-arm-inl.h

Index: src/arm/assembler-arm-inl.h
diff --git a/src/arm/assembler-arm-inl.h b/src/arm/assembler-arm-inl.h
index 114ec234d271c71f76cc14f23ae235129af67a9e..5be57709e382ee4781f2a68ab33e9dea24c65fa3 100644
--- a/src/arm/assembler-arm-inl.h
+++ b/src/arm/assembler-arm-inl.h
@@ -120,9 +120,8 @@ Address RelocInfo::call_address() {
 
 
 void RelocInfo::set_call_address(Address target) {
-  ASSERT(IsPatchedReturnSequence());
-  // The 2 instructions offset assumes patched return sequence.
-  ASSERT(IsJSReturn(rmode()));
+  ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
+         (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
   Memory::Address_at(pc_ + 2 * Assembler::kInstrSize) = target;
 }
 
@@ -132,16 +131,15 @@ Object* RelocInfo::call_object() {
 }
 
 
-Object** RelocInfo::call_object_address() {
-  ASSERT(IsPatchedReturnSequence());
-  // The 2 instructions offset assumes patched return sequence.
-  ASSERT(IsJSReturn(rmode()));
-  return reinterpret_cast<Object**>(pc_ + 2 * Assembler::kInstrSize);
+void RelocInfo::set_call_object(Object* target) {
+  *call_object_address() = target;
 }
 
 
-void RelocInfo::set_call_object(Object* target) {
-  *call_object_address() = target;
+Object** RelocInfo::call_object_address() {
+  ASSERT((IsJSReturn(rmode()) && IsPatchedReturnSequence()) ||
+         (IsDebugBreakSlot(rmode()) && IsPatchedDebugBreakSlotSequence()));
+  return reinterpret_cast<Object**>(pc_ + 2 * Assembler::kInstrSize);
 }