MIPS: Tiny improvement of register constraints in LClassOfTest instructions.

src/mips/lithium-codegen-mips.cc

Index: src/mips/lithium-codegen-mips.cc
diff --git a/src/mips/lithium-codegen-mips.cc b/src/mips/lithium-codegen-mips.cc
index 796e61d6717e35825682ca705a8ad138742e61e9..2075baf0c343bdce4c3495ab95c0d99b8aa824ef 100644
--- a/src/mips/lithium-codegen-mips.cc
+++ b/src/mips/lithium-codegen-mips.cc
@@ -1862,9 +1862,8 @@ void LCodeGen::DoHasCachedArrayIndexAndBranch(
 }
 
 
-// Branches to a label or falls through with this instance class-name adr
-// returned in temp reg, available for comparison by the caller. Trashes the
-// temp registers, but not the input. Only input and temp2 may alias.
+// Branches to a label or falls through with the answer in flags.  Trashes
+// the temp registers, but not the input.
 void LCodeGen::EmitClassOfTest(Label* is_true,
                                Label* is_false,
                                Handle<String>class_name,
@@ -1872,7 +1871,9 @@ void LCodeGen::EmitClassOfTest(Label* is_true,
                                Register temp,
                                Register temp2) {
   ASSERT(!input.is(temp));
-  ASSERT(!temp.is(temp2));  // But input and temp2 may be the same register.
+  ASSERT(!input.is(temp2));
+  ASSERT(!temp.is(temp2));
+
   __ JumpIfSmi(input, is_false);
 
   if (class_name->IsEqualTo(CStrVector("Function"))) {