[embedded] Disable building from textual interface files in Embedded Swift

Author: kubamracek

lib/Frontend/CompilerInvocation.cpp

@@ -3701,6 +3701,7 @@ bool CompilerInvocation::parseArgs(
     IRGenOpts.DisableLegacyTypeInfo = true;
     IRGenOpts.ReflectionMetadata = ReflectionMetadataMode::None;
     IRGenOpts.EnableReflectionNames = false;
+    FrontendOpts.DisableBuildingInterface = true;
     TypeCheckerOpts.SkipFunctionBodies = FunctionBodySkipping::None;
     SILOpts.SkipFunctionBodies = FunctionBodySkipping::None;
     SILOpts.CMOMode = CrossModuleOptimizationMode::Everything;

test/embedded/concurrency-actors.swift

@@ -9,10 +9,6 @@
 // REQUIRES: optimized_stdlib
 // REQUIRES: OS=macosx
 
-// The Darwin SDK overlay module in the macOS SDK cannot be imported in
-// embedded Swift mode.
-// XFAIL: OS=macosx
-
 import _Concurrency
 
 actor Number {

test/embedded/concurrency-async-let.swift

@@ -9,10 +9,6 @@
 // REQUIRES: optimized_stdlib
 // REQUIRES: OS=macosx
 
-// The Darwin SDK overlay module in the macOS SDK cannot be imported in
-// embedded Swift mode.
-// XFAIL: OS=macosx
-
 import _Concurrency
 
 func fib(_ n: Int) -> Int {

test/embedded/concurrency-simple.swift

@@ -9,10 +9,6 @@
 // REQUIRES: optimized_stdlib
 // REQUIRES: OS=macosx
 
-// The Darwin SDK overlay module in the macOS SDK cannot be imported in
-// embedded Swift mode.
-// XFAIL: OS=macosx
-
 import _Concurrency
 
 public func test() async -> Int {

test/embedded/darwin-bridging-header.swift

@@ -11,10 +11,6 @@
 // REQUIRES: VENDOR=apple
 // REQUIRES: OS=macosx
 
-// The Darwin SDK overlay module in the macOS SDK cannot be imported in
-// embedded Swift mode.
-// XFAIL: OS=macosx
-
 // BEGIN BridgingHeader.h
 
 #include <unistd.h>

test/embedded/darwin.swift

@@ -9,10 +9,6 @@
 // REQUIRES: VENDOR=apple
 // REQUIRES: OS=macosx
 
-// The Darwin SDK overlay module in the macOS SDK cannot be imported in
-// embedded Swift mode.
-// XFAIL: OS=macosx
-
 import Darwin
 
 @main

test/embedded/dependencies-concurrency.swift

@@ -47,10 +47,6 @@
 // REQUIRES: optimized_stdlib
 // REQUIRES: OS=macosx
 
-// The Darwin SDK overlay module in the macOS SDK cannot be imported in
-// embedded Swift mode.
-// XFAIL: OS=macosx
-
 import _Concurrency
 
 public func test() async -> Int {