[DebugInfo] Fix handling of @_originallyDefinedIn types

Emit an imported declaration for @_originallyDefinedIn under the
real module that these types live in.

This patch also changes the mangling for the debugger to respect
@_originallyDefinedIn, and fixes a bug where @_originallyDefinedIn
that should be ignored was still being used when mangling.

rdar://137146961

test/DebugInfo/Inputs/local_type_originally_defined_in_other.swift

@@ -1,2 +1,22 @@
-@available(macOS 10, *)
-@_originallyDefinedIn(module: "Barn", macOS 10.1) public struct Horse {}
+@_originallyDefinedIn(
+      module: "Barn", iOS 2.0, macOS 2.0, tvOS 2.0, watchOS 2.0)
+ @available(iOS 1.0, macOS 1.0, tvOS 1.0, watchOS 1.0, *)
+public struct Horse {
+  public init() {}
+}
+
+@_originallyDefinedIn(
+      module: "Barn", iOS 2.0, macOS 2.0, tvOS 2.0, watchOS 2.0)
+ @available(iOS 1.0, macOS 1.0, tvOS 1.0, watchOS 1.0, *)
+public class Cow {
+  public init() {}
+}
+
+
+@_originallyDefinedIn(
+      module: "Barn", iOS 2.0, macOS 2.0, tvOS 2.0, watchOS 2.0)
+ @available(iOS 1.0, macOS 1.0, tvOS 1.0, watchOS 1.0, *)
+public class Sheep {
+  public init() {}
+}
+

test/DebugInfo/local_type_originally_defined_in.swift

@@ -1,9 +1,14 @@
 // RUN: %empty-directory(%t)
 // RUN: %target-swift-frontend -emit-module -emit-module-path %t/local_type_originally_defined_in_other.swiftmodule %S/Inputs/local_type_originally_defined_in_other.swift
-// RUN: %target-swift-frontend -I%t -g -emit-ir %s
+// RUN: %target-swift-frontend -I%t -g -emit-ir %s -o - | %FileCheck %s
+// REQUIRES: OS=macosx
 
 import local_type_originally_defined_in_other
 
+public func definedInOtherModule() {
+  let s = Sheep()
+  // CHECK: DICompositeType(tag: DW_TAG_structure_type, name: "Sheep"{{.*}}identifier: "$s4Barn5SheepCD
+}
 public func localTypeAliasTest(horse: Horse) {
   // The local type mangling for 'A' mentions 'Horse', which must
   // be mangled using it's current module name, and not the
@@ -13,4 +18,21 @@ public func localTypeAliasTest(horse: Horse) {
 
   let info = UnsafeMutablePointer<A>.allocate(capacity: 1)
   _ = info
-}
+  // CHECK: DIDerivedType(tag: DW_TAG_typedef, name: "$s32local_type_originally_defined_in0A13TypeAliasTest5horsey4Barn5HorseV_tF1AL_aD"
+}
+
+public func localTypeAliasTest() -> Horse {
+  typealias B = Int
+
+  let info = UnsafeMutablePointer<B>.allocate(capacity: 1)
+  _ = info
+  return Horse()
+  // CHECK: DIDerivedType(tag: DW_TAG_typedef, name: "$s32local_type_originally_defined_in0A13TypeAliasTest4Barn5HorseVyF1BL_aD"
+}
+
+public func localTypeAliasTestGeneric<T: Cow>(cow: T) {
+  typealias C = Int
+
+  let info = UnsafeMutablePointer<C>.allocate(capacity: 1)
+  _ = info
+}

test/DebugInfo/module_abi_name.swift

@@ -3,11 +3,5 @@
 class SomeClass {}
 // CHECK: DICompositeType(tag: DW_TAG_structure_type, name: "SomeClass",{{.*}}runtimeLang: DW_LANG_Swift, identifier: "$s7Goodbye9SomeClassCD"
 
-@available(macOS 10.13, *)
-@_originallyDefinedIn(module: "ThirdModule", OSX 10.12)
-class DefinedElsewhere {}
-// CHECK: DICompositeType(tag: DW_TAG_structure_type, name: "DefinedElsewhere",{{.*}}runtimeLang: DW_LANG_Swift, identifier: "$s7Goodbye16DefinedElsewhereCD")
-
 let v1 = SomeClass()
-let v2 = DefinedElsewhere()
 

test/DebugInfo/module_abi_name_and_orig_defined_in.swift

@@ -0,0 +1,11 @@
+// RUN: %target-swift-frontend -primary-file %s -emit-ir -g -module-name=Hello -module-abi-name Goodbye -emit-ir -o - | %FileCheck %s
+
+// REQUIRES: OS=macosx
+//
+@available(iOS 1.0, macOS 1.0, tvOS 1.0, watchOS 1.0, *)
+@_originallyDefinedIn(
+     module: "ThirdModule", iOS 2.0, macOS 2.0, tvOS 2.0, watchOS 2.0)
+public class DefinedElsewhere {}
+// CHECK: DICompositeType(tag: DW_TAG_structure_type, name: "DefinedElsewhere",{{.*}}runtimeLang: DW_LANG_Swift, identifier: "$s11ThirdModule16DefinedElsewhereCD")
+
+let v2 = DefinedElsewhere()

test/DebugInfo/originally_defined_in.swift

@@ -1,14 +1,41 @@
-// RUN: %target-swift-frontend -primary-file %s -emit-ir -g -o - | %FileCheck %s
+// RUN: %target-swift-frontend -primary-file %s -emit-ir -g -o -
 
- @_originallyDefinedIn(
-      module: "Other", iOS 2.0, macOS 2.0, tvOS 2.0, watchOS 2.0)
- @available(iOS 1.0, macOS 1.0, tvOS 1.0, watchOS 1.0, *)
- public struct A {
-     let i = 10
- }
+// REQUIRES: OS=macosx
+//
+@_originallyDefinedIn(
+     module: "Other", iOS 2.0, macOS 2.0, tvOS 2.0, watchOS 2.0)
+@available(iOS 1.0, macOS 1.0, tvOS 1.0, watchOS 1.0, *)
+public struct A {
+    let i = 10
+}
 
- // CHECK: !DICompositeType(tag: DW_TAG_structure_type, name: "A",{{.*}}identifier: "$s21originally_defined_in1AVD",{{.*}}specification: ![[S1:[0-9]+]]
- // CHECK: [[S1]] = !DICompositeType(tag: DW_TAG_structure_type, name: "A", scope: ![[S2:[0-9]+]]
- // CHECK: [[S2]] = !DIModule({{.*}}name: "Other"
+@_originallyDefinedIn(
+     module: "Other", iOS 2.0, macOS 2.0, tvOS 2.0, watchOS 2.0)
+@available(iOS 1.0, macOS 1.0, tvOS 1.0, watchOS 1.0, *)
+public struct B {
+    let i = 10
+}
+
+// Test that a type with an invalid @_originallyDefinedIn does not change the mangled name.
+@_originallyDefinedIn(
+     module: "Other", iOS 2.0, macOS 2.0, tvOS 2.0, watchOS 2.0)
+@available(iOS 1.0, macOS 1.0, tvOS 1.0, watchOS 1.0, *)
+private struct Invalid {
+    let i = 20
+}
+
+// CHECK: ![[MOD:[0-9]+]] = !DIModule(scope: null, name: "originally_defined_in"
+//
+// CHECK: !DICompositeType(tag: DW_TAG_structure_type, name: "A",{{.*}}scope: ![[S:[0-9]+]]{{.*}}identifier: "$s5Other1AVD"
+// CHECK: [[S]] = !DIModule({{.*}}name: "Other"
+
+// CHECK: DICompositeType(tag: DW_TAG_structure_type, name: "Invalid",{{.*}}identifier: "$s21originally_defined_in
+
+// CHECK: !DIImportedEntity(tag: DW_TAG_imported_declaration, name: "$s5Other1AVD",{{.*}}scope: ![[MOD]]
+//
+// CHECK: !DICompositeType(tag: DW_TAG_structure_type, name: "$s5Other1AV_ACtD",
 
 let a = A()
+let b = B.self
+let c = (A(), A())
+private let i = Invalid()