[turbofan] Improve representation selection for Smi checking.

src/compiler/opcodes.h

Index: src/compiler/opcodes.h
diff --git a/src/compiler/opcodes.h b/src/compiler/opcodes.h
index e5733e59471fe9bb3516d5fd6f8bb298e1f94724..16f5c1cfa4865deb0f5262248f072084a48307b4 100644
--- a/src/compiler/opcodes.h
+++ b/src/compiler/opcodes.h
@@ -190,12 +190,15 @@
   V(CheckedUint32Div)                 \
   V(CheckedUint32Mod)                 \
   V(CheckedInt32Mul)                  \
+  V(CheckedInt32ToTaggedSigned)       \
   V(CheckedUint32ToInt32)             \
+  V(CheckedUint32ToTaggedSigned)      \
   V(CheckedFloat64ToInt32)            \
   V(CheckedTaggedSignedToInt32)       \
   V(CheckedTaggedToInt32)             \
   V(CheckedTruncateTaggedToWord32)    \
-  V(CheckedTaggedToFloat64)
+  V(CheckedTaggedToFloat64)           \
+  V(CheckedTaggedToTaggedSigned)
 
 #define SIMPLIFIED_COMPARE_BINOP_LIST(V) \
   V(NumberEqual)                         \
@@ -286,8 +289,8 @@
   V(CheckMaps)                      \
   V(CheckNumber)                    \
   V(CheckString)                    \
-  V(CheckTaggedPointer)             \
-  V(CheckTaggedSigned)              \
+  V(CheckSmi)                       \
+  V(CheckHeapObject)                \
   V(CheckFloat64Hole)               \
   V(CheckTaggedHole)                \
   V(ConvertTaggedHoleToUndefined)   \