A64: Synchronize with r16024.

src/a64/codegen-a64.cc

Index: src/a64/codegen-a64.cc
diff --git a/src/a64/codegen-a64.cc b/src/a64/codegen-a64.cc
index 27d2a431182721c013880b805d59e2eb0cae8b37..dc4f41c07f760e94ba9fb1f1d5d75d16eb78a73c 100644
--- a/src/a64/codegen-a64.cc
+++ b/src/a64/codegen-a64.cc
@@ -475,7 +475,7 @@ void StringCharLoadGenerator::Generate(MacroAssembler* masm,
     // Assert that we do not have a cons or slice (indirect strings) here.
     // Sequential strings have already been ruled out.
     __ Tst(result, kIsIndirectStringMask);
-    __ Assert(eq, "external string expected, but not found");
+    __ Assert(eq, kExternalStringExpectedButNotFound);
   }
   // Rule out short external strings.
   STATIC_CHECK(kShortExternalStringTag != 0);