TurboFan: Introduce TaggedSigned and TaggedPointer representations.

src/compiler/machine-operator.cc

Index: src/compiler/machine-operator.cc
diff --git a/src/compiler/machine-operator.cc b/src/compiler/machine-operator.cc
index d1da6848b00baf523be342ff7ab67516df49effe..f4f9bbbcb88ae3a1101e380b0bc6f9f833b04808 100644
--- a/src/compiler/machine-operator.cc
+++ b/src/compiler/machine-operator.cc
@@ -438,6 +438,8 @@ MachineRepresentation AtomicStoreRepresentationOf(Operator const* op) {
   V(kWord16)                           \
   V(kWord32)                           \
   V(kWord64)                           \
+  V(kTaggedSigned)                     \
+  V(kTaggedPointer)                    \
   V(kTagged)
 
 #define ATOMIC_TYPE_LIST(V) \