[x64] Smi zero can be used as an immediate.

src/compiler/x64/instruction-selector-x64.cc

Index: src/compiler/x64/instruction-selector-x64.cc
diff --git a/src/compiler/x64/instruction-selector-x64.cc b/src/compiler/x64/instruction-selector-x64.cc
index df0f8809a7bb87c2c3c33246959cbea2eb8ec2f8..c841acebc0667ea95086a3c29a825650f70d1643 100644
--- a/src/compiler/x64/instruction-selector-x64.cc
+++ b/src/compiler/x64/instruction-selector-x64.cc
@@ -27,6 +27,10 @@ class X64OperandGenerator final : public OperandGenerator {
         const int64_t value = OpParameter<int64_t>(node);
         return value == static_cast<int64_t>(static_cast<int32_t>(value));
       }
+      case IrOpcode::kNumberConstant: {
+        const double value = OpParameter<double>(node);
+        return bit_cast<int64_t>(value) == 0;
+      }
       default:
         return false;
     }