Support Smi in CompareIDAndBranch

src/x64/lithium-x64.cc

Index: src/x64/lithium-x64.cc
diff --git a/src/x64/lithium-x64.cc b/src/x64/lithium-x64.cc
index d7ac279a4cd852d27b4232c5613712169df5f9d3..9a88c5b570774c4aee3fc10ab63270083c1e087b 100644
--- a/src/x64/lithium-x64.cc
+++ b/src/x64/lithium-x64.cc
@@ -1597,9 +1597,10 @@ LInstruction* LChunkBuilder::DoCompareGeneric(HCompareGeneric* instr) {
 LInstruction* LChunkBuilder::DoCompareIDAndBranch(
     HCompareIDAndBranch* instr) {
   Representation r = instr->representation();
-  if (r.IsInteger32()) {
-    ASSERT(instr->left()->representation().IsInteger32());
-    ASSERT(instr->right()->representation().IsInteger32());
+  if (r.IsSmiOrInteger32()) {
+    ASSERT(instr->left()->representation().IsSmiOrInteger32());
+    ASSERT(instr->left()->representation().Equals(
+        instr->right()->representation()));
     LOperand* left = UseRegisterOrConstantAtStart(instr->left());
     LOperand* right = UseOrConstantAtStart(instr->right());
     return new(zone()) LCmpIDAndBranch(left, right);