MIPS: The check for internalized strings relied on the fact that we had less than 64 distinct Insta…

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..8a00f605639e2cf5270d850484435d9f1c45a700 100644
--- a/src/mips/ic-mips.cc
+++ b/src/mips/ic-mips.cc
@@ -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);