Improve polymorphic loads on single slots.

src/arm/lithium-arm.cc

Index: src/arm/lithium-arm.cc
diff --git a/src/arm/lithium-arm.cc b/src/arm/lithium-arm.cc
index 108a6de6276f0eb57bab78a2be860c427a52b40b..956d7cbf7205149642ddce13a1dbda64bcf91c0f 100644
--- a/src/arm/lithium-arm.cc
+++ b/src/arm/lithium-arm.cc
@@ -1738,9 +1738,9 @@ 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);
 }