[IRGen] Emit swift_enumSimple_destructiveInjectEnumTag

Author: drexin

lib/IRGen/GenValueWitness.cpp

@@ -960,7 +960,7 @@ getDestructiveInjectEnumTagFunction(IRGenModule &IGM,
          (tzCount % toCount != 0))) {
       return nullptr;
     } else {
-      return nullptr;
+      return IGM.getEnumSimpleDestructiveInjectEnumTagFn();
     }
   }
 }

test/Interpreter/layout_string_witnesses_dynamic.swift

@@ -594,6 +594,30 @@ func testResilientMultiPayloadEnumGenericTag() {
 
 testResilientMultiPayloadEnumGenericTag()
 
+@inline(never)
+func matchResilientSinglePayloadEnumSimpleTag(_ x: ResilientSinglePayloadEnumSimple) -> Int {
+    return switch x {
+    case .nonEmpty: 0
+    case .empty0: 1
+    case .empty1: 2
+    }
+}
+
+func testResilientSinglePayloadEnumSimpleInjectTag() {
+    let x = ResilientSinglePayloadEnumSimple.nonEmpty(SimpleClass(x: 23))
+    let y = ResilientSinglePayloadEnumSimple.empty0
+    let z = ResilientSinglePayloadEnumSimple.empty1
+
+    // CHECK: Enum case: 0
+    print("Enum case: \(matchResilientSinglePayloadEnumSimpleTag(x))")
+    // CHECK: Enum case: 1
+    print("Enum case: \(matchResilientSinglePayloadEnumSimpleTag(y))")
+    // CHECK: Enum case: 2
+    print("Enum case: \(matchResilientSinglePayloadEnumSimpleTag(z))")
+}
+
+testResilientSinglePayloadEnumSimpleInjectTag()
+
 @inline(never)
 func matchResilientSinglePayloadEnumGenericTag(_ x: ResilientSinglePayloadEnumGeneric<AnyObject>) -> Int {
     return switch x {