Merge pull request #85010 from artemcm/AlwaysRebuildExplicitInterface

[Explicit Module Builds] Always rebuild the target module in explicit `-compile-module-from-interface` builds.

lib/Frontend/ModuleInterfaceLoader.cpp

@@ -1609,27 +1609,6 @@ bool ModuleInterfaceLoader::buildExplicitSwiftModuleFromSwiftInterface(
     StringRef outputPath, bool ShouldSerializeDeps,
     ArrayRef<std::string> CompiledCandidates,
     DependencyTracker *tracker) {
-
-  if (!Instance.getInvocation().getIRGenOptions().AlwaysCompile) {
-    // First, check if the expected output already exists and possibly
-    // up-to-date w.r.t. all of the dependencies it was built with. If so, early
-    // exit.
-    UpToDateModuleCheker checker(
-        Instance.getASTContext());
-    ModuleRebuildInfo rebuildInfo;
-    SmallVector<FileDependency, 3> allDeps;
-    std::unique_ptr<llvm::MemoryBuffer> moduleBuffer;
-    if (checker.swiftModuleIsUpToDate(outputPath, rebuildInfo, allDeps,
-                                      moduleBuffer)) {
-      if (Instance.getASTContext()
-              .LangOpts.EnableSkipExplicitInterfaceModuleBuildRemarks) {
-        Instance.getDiags().diagnose(
-            SourceLoc(), diag::explicit_interface_build_skipped, outputPath);
-      }
-      return false;
-    }
-  }
-
   // Read out the compiler version.
   llvm::BumpPtrAllocator alloc;
   llvm::StringSaver ArgSaver(alloc);