Improve polymorphic loads on single slots.

src/mips/lithium-mips.cc

Index: src/mips/lithium-mips.cc
diff --git a/src/mips/lithium-mips.cc b/src/mips/lithium-mips.cc
index 1c4e1da3fbca3d189ba7d8f14fa2fab4b361dae6..61b2abb5d52603348531d3e9485be350a55177da 100644
--- a/src/mips/lithium-mips.cc
+++ b/src/mips/lithium-mips.cc
@@ -1740,9 +1740,9 @@ LInstruction* LChunkBuilder::DoCheckFunction(HCheckFunction* instr) {
 }
 
 
-LInstruction* LChunkBuilder::DoCheckMap(HCheckMap* instr) {
+LInstruction* LChunkBuilder::DoCheckMaps(HCheckMaps* instr) {
   LOperand* value = UseRegisterAtStart(instr->value());
-  LInstruction* result = new(zone()) LCheckMap(value);
+  LInstruction* result = new(zone()) LCheckMaps(value);
   return AssignEnvironment(result);
 }