[clang][modules] Remove _Private suffix from framework auto-link hints. (llvm#77120)

- [clang][modules] Remove no longer needed autolink test for TBD files.
- [clang][modules] Remove `_Private` suffix from framework auto-link
hints.

(cherry picked from commit f4bc70e)

Author: ributzka

clang/lib/Lex/ModuleMap.cpp

@@ -994,7 +994,9 @@ static void inferFrameworkLink(Module *Mod) {
   assert(!Mod->isSubFramework() &&
          "Can only infer linking for top-level frameworks");
 
-  Mod->LinkLibraries.push_back(Module::LinkLibrary(Mod->Name,
+  StringRef FrameworkName(Mod->Name);
+  FrameworkName.consume_back("_Private");
+  Mod->LinkLibraries.push_back(Module::LinkLibrary(FrameworkName.str(),
                                                    /*IsFramework=*/true));
 }
 

clang/test/Modules/Inputs/AutolinkTBD.framework/AutolinkTBD.tbd

@@ -0,0 +1,25 @@
+// Test that autolink hints for frameworks don't use the private module name.
+// RUN: rm -rf %t && mkdir %t
+// RUN: split-file %s %t
+
+// RUN: %clang_cc1 -emit-llvm -o - -fmodules-cache-path=%t/ModuleCache -fmodules -fimplicit-module-maps -F %t/Frameworks %t/test.m | FileCheck %s
+
+// CHECK:     !{!"-framework", !"Autolink"}
+// CHECK-NOT: !{!"-framework", !"Autolink_Private"}
+
+//--- test.m
+#include <Autolink/Autolink.h>
+#include <Autolink/Autolink_Private.h>
+
+//--- Frameworks/Autolink.framework/Headers/Autolink.h
+void public();
+
+//--- Frameworks/Autolink.framework/PrivateHeaders/Autolink_Private.h
+void private();
+
+//--- Frameworks/Autolink.framework/Modules/module.modulemap
+framework module Autolink { header "Autolink.h"}
+
+//--- Frameworks/Autolink.framework/Modules/module.private.modulemap
+framework module Autolink_Private { header "Autolink_Private.h"}
+