A64: Synchronize with r15545.

src/mips/ic-mips.cc

Index: src/mips/ic-mips.cc
diff --git a/src/mips/ic-mips.cc b/src/mips/ic-mips.cc
index b30ee31ff62a9da24dc251e9bf1a83b7ac147a83..896e03007b9869b6fad6c883de065f3f6891e725 100644
--- a/src/mips/ic-mips.cc
+++ b/src/mips/ic-mips.cc
@@ -29,7 +29,7 @@
 
 #include "v8.h"
 
-#if defined(V8_TARGET_ARCH_MIPS)
+#if V8_TARGET_ARCH_MIPS
 
 #include "codegen.h"
 #include "code-stubs.h"
@@ -326,7 +326,8 @@ static void GenerateKeyNameCheck(MacroAssembler* masm,
   __ And(at, hash, Operand(Name::kContainsCachedArrayIndexMask));
   __ Branch(index_string, eq, at, Operand(zero_reg));
 
-  // Is the string internalized?
+  // Is the string internalized? We know it's a string, so a single
+  // bit test is enough.
   // map: key map
   __ lbu(hash, FieldMemOperand(map, Map::kInstanceTypeOffset));
   STATIC_ASSERT(kInternalizedTag != 0);