ModuleInterface: Introduce the %target-swift-emit-module-interface and %target-swift-typecheck-module-from-interface lit substitutions and adopt them in some tests that involve emitting a swiftinterface. The substitutions specify the additional flags -swift-version 5 -enable-library-evolution. There are a few motivations for adding these substitutions:

- Tests that depend on emitted interfaces should generally use flags that are typical for modules that have textual interfaces (e.g. `-enable-library-evolution`).
- If a test is intended to produce a valid `swiftinterface` then it should verify that interface. This will help prevent interface printing regressions caused by compiler changes.
- Having commonly used substitutions for tests that emit interfaces makes it easy to experiment with compiler flags that might effect interface printing.

Resolves rdar://91634358

Author: tshortli

docs/Testing.md

@@ -338,6 +338,17 @@ code for the target that is not the build machine:
 * ``%target-swift-autolink-extract``: run ``swift-autolink-extract`` for the
   target to extract its autolink flags on platforms that support them (when the
   autolink-extract feature flag is set)
+  
+* ``%target-swift-emit-module-interface(`` *swift interface path* ``)``
+  *other arguments*: run ``swift-frontend`` for the target, emitting a
+  swiftinterface to the given path and passing additional default flags
+  appropriate for resilient frameworks.
+
+* ``%target-swift-typecheck-module-from-interface(`` *swift interface path*
+  ``)`` *other arguments*: run ``swift-frontend`` for the target, verifying
+  the swiftinterface at the given path and passing additional default flags
+  appropriate for resilient frameworks. Designed to be used in combination with
+  ``%target-swift-emit-module-interface()``.
 
 * ``%target-clang``: run the system's ``clang++`` for the target.
 

test/AutoDiff/ModuleInterface/differentiation.swift

@@ -1,4 +1,5 @@
-// RUN: %target-swift-frontend -typecheck -emit-module-interface-path %t.swiftinterface -enable-library-evolution %s
+// RUN: %target-swift-emit-module-interface(%t.swiftinterface) %s
+// RUN: %target-swift-typecheck-module-from-interface(%t.swiftinterface)
 // RUN: %FileCheck %s < %t.swiftinterface
 
 import _Differentiation

test/ModuleInterface/attrs.swift

@@ -1,4 +1,5 @@
-// RUN: %target-swift-frontend -typecheck -emit-module-interface-path %t.swiftinterface -enable-library-evolution %s
+// RUN: %target-swift-emit-module-interface(%t.swiftinterface) %s -module-name attrs
+// RUN: %target-swift-typecheck-module-from-interface(%t.swiftinterface) -module-name attrs
 // RUN: %FileCheck %s < %t.swiftinterface
 
 // CHECK: @_transparent public func glass() -> Swift.Int { return 0 }{{$}}

test/ModuleInterface/conformances.swift

@@ -1,4 +1,5 @@
-// RUN: %target-swift-frontend-typecheck -emit-module-interface-path %t.swiftinterface %s
+// RUN: %target-swift-emit-module-interface(%t.swiftinterface) %s -module-name conformances
+// RUN: %target-swift-typecheck-module-from-interface(%t.swiftinterface) -module-name conformances
 // RUN: %FileCheck %s < %t.swiftinterface
 // RUN: %FileCheck -check-prefix CHECK-END %s < %t.swiftinterface
 // RUN: %FileCheck -check-prefix NEGATIVE %s < %t.swiftinterface

test/ModuleInterface/full-convention.swift

@@ -1,4 +1,7 @@
-// RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -typecheck -swift-version 5 -emit-module-interface-path - -enable-library-evolution %s -experimental-print-full-convention -use-clang-function-types | %FileCheck %s
+// RUN: %empty-directory(%t)
+// RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -typecheck -swift-version 5 -emit-module-interface-path %t/full-convention.swiftinterface -enable-library-evolution %s -experimental-print-full-convention -use-clang-function-types
+// RUN: %target-swift-frontend(mock-sdk: %clang-importer-sdk) -typecheck-module-from-interface %t/full-convention.swiftinterface
+// RUN: %FileCheck %s < %t/full-convention.swiftinterface
 
 import ctypes
 

test/lit.cfg

@@ -2259,6 +2259,12 @@ config.substitutions.append(('%target-pic-opt', config.target_pic_opt))
 config.substitutions.append(('%target-msvc-runtime-opt',
                              config.target_msvc_runtime_opt))
 
+config.substitutions.append(('%target-swift-emit-module-interface\(([^)]+)\)',
+                             SubstituteCaptures(r'%target-swift-frontend -swift-version 5 -enable-library-evolution -typecheck -emit-module-interface-path \1')))
+
+config.substitutions.append(('%target-swift-typecheck-module-from-interface\(([^)]+)\)',
+                             SubstituteCaptures(r'%target-swift-frontend -swift-version 5 -enable-library-evolution -typecheck-module-from-interface \1')))
+
 config.substitutions.append(('%target-typecheck-verify-swift', config.target_parse_verify_swift))
 
 config.substitutions.append(('%target-swift-emit-silgen\(mock-sdk:([^)]+)\)',