A64: Synchronize with r18444.

src/a64/macro-assembler-a64.cc

Index: src/a64/macro-assembler-a64.cc
diff --git a/src/a64/macro-assembler-a64.cc b/src/a64/macro-assembler-a64.cc
index 2f2532861ab4689676d316c302ecbd6e388e94aa..d6ef3957add94bda167390bbdeb28960d409c468 100644
--- a/src/a64/macro-assembler-a64.cc
+++ b/src/a64/macro-assembler-a64.cc
@@ -4325,12 +4325,13 @@ void MacroAssembler::AssertRegisterIsClear(Register reg, BailoutReason reason) {
 
 
 void MacroAssembler::AssertRegisterIsRoot(Register reg,
-                                          Heap::RootListIndex index) {
+                                          Heap::RootListIndex index,
+                                          BailoutReason reason) {
   // CompareRoot uses Tmp0().
   ASSERT(!reg.Is(Tmp0()));
   if (emit_debug_code()) {
     CompareRoot(reg, index);
-    Check(eq, kRegisterDidNotMatchExpectedRoot);
+    Check(eq, reason);
   }
 }